... :16mm,19mm,22mm,24mm Solid Rubber Ball for Industry (not inflatable):1. Size: φ16mm, φ19mm, φ22mm, φ24mm, φ26mm, 28mm,32mm, φ35mm ... : Nature Rubber, NBR, Ethylene-Propylene Rubber, Polyurethane Rubber 4. Color: White, Tan, Transparent5. Density: 0.93g/cm36. Hardness: 30~100Sh°A7 ... , please view our website! Solid Rubber Ball for Industry (not inflatable)