Detailed Product Description sponge abrasive ( home-made sponge)sponge abrasive uses sponge as a substrate,we will plant the sand on the sponge,it is a polishing material,it could absorb water,it can be made into all kinds of sharps & sizes.suit for grinding curved surface, furniture,the surface of the plastic cement ,it is water-proof & acid and alkali-resistance ,can be used again & again