3M(TM) ESPE(TM) Sof-Lex(TM) Finishing Strips - Coarse/Medium Designed to complete the Sof-Lex system, Sof-Lex finishing and polishing strips are gapped at their centers for easy interproximal insertion, and are precision-coated with an aluminum-oxide grit. Available in refills of 150 coarse/medium strips. * Easy-to-use Sof-Lex finishing and polishing system allows you to create high-luster restorations that offer lifelike esthetics. * Strips are gapped at their centers for easy interproximal insertion. * Precision-coated with an aluminum-oxide grit to produce a smooth restoration surface that helps prevent interproximal plaque build up.