- The discs have a metallic center to facilitate quick and practical mandrel fitting. - Flexible discs that allow better interproximal access and control during use. - The Praxis system for finishing and polishing resin restorations is made up of sanding discs and a pressure mandrel that provides agility in reversing and replacing the discs - Pack contains: - Praxis - 120 assorted discs + mandrel. **For further product information, please contact Chat Support**