WINSINN GT2 Idler Pulley 20 Toothless 3mm Bore 10mm width Timing Pulley Wheel Aluminum For 3D Printer (Pack of 5Pcs)

Appear to be good quality and size is correct unlike some cheaper equivalents. Bearings are also nice and free. As always its hard to know how long they will last under use but so far all is good.

Purchased based on previous review stating they were GT3's and not GT2's.Perfect for what I needed, but make sure that you need GOD'S, as they definitely are not GOD'S!

From 10 units not even one had bearing which worked - every single one worked like it had sand instead ball bearings inside. Total height of pulley is 14mm not 13mm as it should be.

They're round and rotate, can't really go wrong

Ideal for my mpcnc project, arrived quick and exactly as described, great quality.

Working pretty well so far