3M™ Sof-Lex™ extra-thin finishing and polishing discs, 3/8" diameter, medium, 8693M. Features: - Flexible polishing discs with an aluminum oxide coating. - Discs can be easily changed due to the patented pop-on mandrel system. Indications: - Sof-Lex polishing discs for facial and lingual margins of anterior and posterior restorations.