C-Prime Plus New Break-Through Poly-Cotton Ceramic Technology Provides 50-60% Higher Stock Removal Rates Than Previous Ceramic Grain Products. Our Nylon 6 Backing Plate Offers Excellent Flexibility During Course Of Operation And Can Be Trimmed Back Multiple Times During Use. Ceramic Grain Is Self-Sharpening, Cuts Cool With A Built In Grinding Aid And Has Higher Stock Removal Rates Compared To Zirconia Grain Flap Discs. Weldcote Compressed Design Technology Provides $ Savings To The End-User. Internal Built-In Threads Built-In Threads Improves Throughput.