Step X Master Piece: Repair the defects to restore the original paint surface. Compatible with DA/RO Polisher and wool/foam pad. Ultra-micro abrasives minimize the secondary scratches on the paint surface. Hobby Cut Sander: Able to removes #3000 grit & fine sanding marks. Compatible with DA/RO Polisher and wool/sponge pad. Only apply small amount and get high efficiency results.