Standard "C" weight paper discs made from aluminum oxide with a non-loading stearate. Stick self adhesive sanding disc to appropriate back up pad attached to an orbital or DA disc sander. Ideal for finish sanding on woods, paints, metal, plastic, cultured marble and solid surface. A protective release liner provides for maximum adhesion and prevents grit, dust and air from degrading the disc's backing. 25 discs per box. All new, sealed and packaged.