This pair of finishing blocks from ImpressArt is a "must have" tool for your handcrafted jewelry and metal-working projects. Each block features two grit levels perfect for buffing and polishing surfaces, adding a matte finish, sanding rough edges and much more!Details:Fine/extra fine high polish and medium/coarse matte finish grit4.15" x 2.5" x 1.75" (10.5cm x 6.4cm x 4.4cm)2 blocksFoam and abrasive