The Shark coarse brown surface preparation discs are shipped in a clam shell-Package with 10 discs per-Pack. The 2-Inch coarse discs are compatible with all major brand holders with the twist-lock button system. These long life discs are guaranteed to perform as good or better than other leading brands. The buttons are affixed to the holder by spin-welding, which guarantees you the best results. These noticeably thicker discs will not disappoint the user with their great performance.