100 PCS 608-2RS Ball Bearing - Double Rubber Sealed Shielded Miniature Deep Groove Bearings for Furniture Wheel, Small Machinery, Electric Motors, Hobby Drones, 3D Printers(8mm x 22mm x 7mm)(608 2RS)

As others have stated these are covered in grease. Its a basic coating that most bearings you order come with and was not a big deal. The bearings come in these plasic tube holders and all i did was fill it up with rubbing alcohol (best i had) and shook it then used a paper towel to clean them off. So far out of the 2 tubes ive done that to and tested, ive only had 2 hard to move bearings. It was clear this was due to the plastic cover not fitting well and not a problem with the bearing itself. If you have the time to clean them or were planning on using the bearings in a more mechanically heavy application and will grease them yourself then these are perfect. Very cheap and so far average quality. The grease smell is just a normal one i dont know why some people were overreacting. Im building mechanical joints for a raspberry pi project and these are exactly what i needed to ensure everything moves properly. I may clean them and mix in graphite powder with more grease to use them as sliprings since damage is not a concern for the sheer plethora i now have.

These are excellent quality for the low speed applications for which I buy bearings like this in my home machine shop. I use them as guides in various applications. For that they are an excellent value. I don't think the quality is high enough that I would use them in skates or skateboards, but it should be clear that these are designed for a low price point, not high quality high speed low rolling resistance applications. They aren't exactly gritty or sloppy, just not quite the quality I would want for those applications.

Overall very decent bearings for fidget spinners. Not Amazing, but the affordability alone makes these bearings a competitive product and after thoroughly cleaning them they worked well and spin for a decent amount of time. If you are using these bearings to make spinners as gifts (as I did) then these will work just fine. If you are making them to sell… I would probably pay just a little more for a higher quality bearing. I am not sure why I liked the “single lip contact seals” of these bearing so much but they were very easy to remove for cleaning and better yet easy to put back onto the bearing afterwards. Just don’t pry them up where the “608RS” is stamped as they are thinner there and are more likely to break in that area. Taking everything into account I would say that you get a good bearing for the price. The only thing I didn’t like (which cost a star 4/5 instead of 5/5) was the lubricant that they used inside of the bearing. I am not sure if they used a silicon or what but when I received the bearings, they were stiff and sticky and didn’t want to spin. With other bearings I was used to having them packed with grease. This was not the case here. These bearings were hard to spin and were pretty much unusable directly out of the package. These bearings were not packed with grease (as many bearings are) and when I took them apart to clean them, I didn’t see any grease at all. As I mentioned before they seemed sticky as opposed to being slick or slippery and I had a difficult time even spinning them. I figured I would simply soak them in 100% Pure Acetone as this is usually enough to remove lubricants from bearings that I have worked with previously. Unfortunately, after soaking them for over 24 hours in Pure Acetone (shaking the container occasionally) they were still stiff and sticky! I almost didn’t believe it. I soaked them for another 24 hours and they were still sticky! I ended up having to use some Carburetor Cleaner and then an Engine Degreaser to cut through whatever was making them sticky. I was kind of shocked at how resilient this sticky substance was. After finally being able to remove the sticky stuff from the bearings they smelled pretty bad (engine degreaser smells). So, I soaked them in 100% Acetone again for a couple of days, took them out, sprayed them off with compressed air while spinning each one and then I let them dry. They still kind of smelled so I soaked them again in a clean container with fresh and clean Acetone and that seemed to do the trick. Kind of a lot of work I suppose. But once they were cleaned the bearings fit perfectly, spun well and helped make some pretty good custom fidget spinners. If you don’t feel like thoroughly cleaning your bearings when you receive them then you might not enjoy this particular product. If you are willing to spend some time cleaning and applying some of your own elbow GREASE to get these bearing clean and spinning properly then for the price you probably can’t go wrong.

WayneChicago wrote an excellent review. You should read that before reading mine. He outlines is perfect detail all the reasons why people buying these are complaining. Only he says it with tact and finesse. But I don't have that. So if you want a more direct rebuttal to the absolute nonsense you'll read in the product review section about these being akin to sand-filled garbage, then keep reading. However, If sciency words are just flowery nerdspeak to you and breaks your brain, then just sop reading now and go buy the grossly overpriced BONES bearings. They make the cool whizzing sound on first rip out of the box. Plus they're all shiny and you can't put a price on shiny, can you? Now....If you're not a mental tree stump and words with more than 3 syllables don't frighten you, then by all means, continue on! General Complaint: These are covered in some kind of oil and don't spin. Rebuttal: That is CORRECT! The insides are packed with grease which is thick. Think cooled bacon grease. When you reheat cooled bacon grease, what happens to it? It thins out and becomes more viscous, right?? Same thing applies here. These are packed with grease because they're designed to be run in machines for long periods of time. Which means heat from rotational friction, which means the grease viscosity inside the bearing thins due to thermal conduction. This is WHY they were built the way they come in the box. So you can use them in machine type applications right out of the box, where thermal friction needs to be considered. Ok, but can I still use them for skateboard or roller skate wheels though? YES, you can but you need to do a little work first. No big deal if you're not lazy. If you want these bearings to spin like a fidget spinner and go whizzzzzzz, you have to dissolve the grease inside the bearings and use a thinner lubricating agent in it's place. WayneChicago goes over how to do just that in his review. So I don't have to. Thanks, Wayne! *fistbump* And if you can't find WayneChicago's review, don't act like you don't have Google. Just look up "How to dissolve grease in ball bearings". This isn't rocket science... As far as I can tell, the outside grease feel is just machining oil which is often times applied to metal surfaces as a water repellant to keep the surfaces from rusting due to atmospheric conditions. Wood workers and machine shop operators know exactly what I'm talking about. Probably some mechanics too. Why would they do that? Well...where are these things made? Is there any water that might get into the bearings in transit from the factory to your house? Yeah, there is. There's literally an ocean of it. Highly corrosive salt water to boot. So, in order to make sure these don't arrive as little jammed up rust cakes at your doorstep courtesy of the Amazon delivery guy, they coat them in a light oil or maybe even some of the inner grease to prevent that from happening. You're WELCOME!! It's a prophylactic measure against people who don't know better. And also so people don't buy these and end up in their review section complaining about that too. Like so many other people are out here doing. The people complaining simply don't know what they don't know. And are trashing a decent product for the price from a company that is CLEARLY putting in an honest effort to deliver value to the consumer for a VERY REASONABLE PRICE. Some of these might have manufacturing defects, Some might last longer than others. When I bought mine they were under $0.30 each. I'm not putting mine under heavy load for long durations anyways, and I'll have PLENTY of replacements should some of them give out, as they sometimes do. I have not tested them yet but I don't need to to know that I DID NOT get screwed on the transaction. This is EXACTLY what I expected and I'm sure will exceed my expectations in performance. Sure, you get what you pay for. But if you know what you need to know before making a purchase, you'll find INCREDIBLE value in these bearings given you're buying them for the right application. If you find yourself with a chapped ass complaining about this product because you didn't know what you needed to know before making the purchase, chances are you also didn't take my advice and spring for the BONES. And that's on you, playa... -5 Stars.

El dia 4 de Junio recibi el producto para utilizarlo en patineta, el primer dia se me rompieron dos piezas y hoy que estamos a 10 de Junio se me rompieron otras 4 piezas, evidenciando la pesima calidad del producto. Cabe reiterar que jamas me habia sucedido algo similar.

Excellent quality and smooth movement. I've used in a few 3d prints and some small woodworking projects. Works well in each situation.

Ça roule mais il y en a un défectueux

What can I say...they're small bearings that spin and can b used in jigs and other DIY devices. If one bearing screws up...u got 100 to replace it with...thumbs up! Only gave them 4 stars...because they're bearings, how much can u talk them up...lol.

Like others have said, you have to clean the heavy grease out and lube em up with something appropriate for skate bearings if you want them to spin real free. Or if you're using them for projects they're just fine as is. Decent bearings all around and great deal.