The Sait 4S/4V Hook & Loop Paper Disc is excellent on painted and primed surfaces. The disc is the longest lasting and best performing Sait has to offer. The premium stearate coating and open coat structure lubricates and prevents loading. The disc is for use on body filler, paint, primers, plastics, wood, fiberglass, ferrous and non-ferrous metals. The disc offers fast removal rates for fine finishing of auto body, wood, metal and marine applications. For dry use only. Includes 50 discs with 6 vacuum holes.