Original product for the Bafang BBS01 and BBS02. For newer Version B and 12 mm shaft diameteror Version A with 10 mm diameter for older models. There are different versions out there. Look in the picture for the right one.
With integrated bearings, Original product of the Bafang BBS01 and BBS02. This one is for Version B. For a noise reduction it is made of nylon. For this reason, it is more vulnerabile if excessive forces act and at the same time no crank movement takes place (brake, wrong gear, etc.)