... sponge rubber ball, polishing ball, silicone ball, corundum ball,etc. sponge rubber ballwe can supply the sponge rubber ball, polishing ball, silicone ball, corundum coated ball for your ... : normal, polishing, surface coated, etc, according to your requirement 5.Color: red, blue, brown, orange,yellow,etc 6.Density: 0.9kg ...