... , 29mm, 31mm, 51.5mm 3.ROHS 1. Olympic virginal rubber bumper plate2.colour available 3. middle bore ... diameter:26.5mm, 28mm, 29mm, 31mm, 51.5mm4. weight setting are:1.25kg, 2.5kg, 5kg, 10kg, 20kg5 ... pure rubber ensure the weight plates won't hurt the floor9.various colour&various weight 10.our factory is a ... manufacturer major in rubber weight plates, so we can offer much lower price11 ...