valve mental boned rubber ball 1.Material: NBR, EPDM, SBR 2.Rubber thickness: 5mm to ... 30mm to 300mm. valve mental boned rubber ball :*multiple sizes: D38.1mm-D420mm1. Rubber ball with metal bone, rubber thickness: 5mm to 10mm ... 300mm.Material: NBR, EPDM, SBR, NR.We also can make with NR, BR, IIR, PU.3. Hardness from 35ShA to 85 ...