9" concavity polishing sponge, for surface flaring. Size:230*35mm, inner diamter is 180mm. various colors various coarseness. 9" concavity polishing sponge, one of the indispensable tools for auto detailing. also use for others surface flaring, such as use to furniture, marble floor, boat body, pool and so on, make the surface more clean and newer. They are made of high quality sponge. round side ...