sponge rubber ball Specialized in manufacture 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 ... your requirement 5.Color: red, blue, brown, orange,yellow,etc 6.Density: 0.9kg/m3-300kg/m3,according to your requirement ...