... used in round screen 2.Material:Nature Rubber 3.Size:16mm,19mm,22mm,24mm Solid Rubber Ball for Industry (not inflatable):1. Size ... . Application:Widely used in round screen3. Material: Nature Rubber, NBR, Ethylene-Propylene Rubber, Polyurethane Rubber 4. Color: White, Tan, Transparent5. Density: 0.93g ... : 1~1.5For more details, please view our website! Solid Rubber Ball for Industry (not inflatable)