This is Mr Hobby Finishing Cloth 1 For Finishing

The important thing in sharpening with compound is the presence of cloth that does not leave scratches or dust on the surface. Mr. Finishing cloth is a sharpening cloth using ultra-fine short fibers for sharpening and a wiping cloth of natural material that does not leave fiber scum on the surface. For finish polishing, it is used for the final finishing of ultra fine compound, etc., and for removing dirt on the surface etc.