Sof-Lex Contouring and Polishing Discs Assortment Kit with Mandrel 1980Description Sof Lex discs combine a flexible backing with a round eyelet and low profile mandrel to yield increased usable abrasive surfaces. These pop on discs have an easy to use, color coded system that is designed to simplify finishing and polishing for composites, ceramics and glass ionomer restorations. Reversible Fast and easy Maximized abrasive surface Choice of disc thickness and flexibility Pop on disc technology makes changing discs easier