The 3M Stikit Gold Paper Disc Roll 216U is designed for convenience, combining open coat aluminum oxide discs with a handy adhesive backing ready for quick attachment to a Stikit backup pad (sold separately). Our disc roll makes the discs easy to grab while eliminating the use of disc liners.Designed for use with a random orbital sander, our discs are made of long-lasting aluminum oxide abrasive grains on a light A-weight paper backing suitable for lightweight sanding and finishing. The open coat and load-resistant coating help prevent loading for a longer service life, and make 3M Stikit Gold Paper Disc Roll 216U discs well-suited for general sanding and finishing applications on a variety of substrates, including paint, primer, wood, metal, plastic, and composites, including fiberglass.