... .5mm, 28mm, 29mm, 31mm, 51.5mm 3.ROHS 1. Olympic virginal rubber bumper plate2.colour available 3. middle bore diameter:26.5mm ... , 2.5kg, 5kg, 10kg, 20kg5. virginal and non-virginal rubber available6. Virginal rubber without any smell and can get the ROSH certification7 ... &various weight 10.our factory is a manufacturer major in rubber weight plates, so we can offer much lower price11. bouncy ...