Sof-Lex - F&P Discs - Medium 1/2", Pop-On, Urethane Coated Paper, Dark Blue. Package of 170. #1982M Thin construction for better interproximal surface access. Used to simplify finishing and polishing procedures. Color-coded design allows for easy identification. With unique pop-on disc technology. Sof-Lex Pop-On Discs are contouring and polishing discs that come with a thin profile for better access to interproximal surfaces. These discs have a combination of flexible backing with a round eyelet and low-profile mandrel design that produces increased usable abrasive surfaces.The discs are color-coded for easy identification of grit sequence, and disc thickness and flexibility depend on procedural needs. The pop-on disc technology adds to the easy-to-use system, resulting in superior luster restorations with natural esthetics.