PEYOND Power Twister Bar-Arm,Shoulder Builder Spring Exercise, Chest and Bicep Blaster

Would you please release a 25kg version of this bar? No company offers one, and this resistance would be desired by many customers...

is this a good product ? or are there better ones out there instead of this one ?

It is very important that I know the correct length (40kg) or I won' buy it? If it's too short, it is useless....'been ripped off before.

What are the lengths of the 40, 50, and 60 kg units?