4” Hook & Loop surface conditioning discs & surface prep discs, MEDIUM aluminum oxide grit. These abrasive’s discs offer superior cleaning and surface preparation with high-quality scotch brite material. These versatile buff and blend discs are perfect for a broad range of applications, from general cleaning to finishing and more. The durable, non-woven construction conforms well to help preserve irregular or contoured surfaces, and the open-web material resists loading and keeps the abrasive minerals cutting at high performance. For use on grinders and polishers for moderate cut down work. Requires a hook and loop backer pad. Non-woven scotch-brite construction Conforms well to irregular surfaces Open-web material resists loading for long life Perfect for surface preparation and cleaning High-performance aluminum oxide abrasives Versatile, durable, and efficient