Lexicon – exceptional quality with Swiss-made precision technology. Exclusively from DENTSPLY Tulsa Dental Specialties, Lexicon is the name you trust for endodontic innovation, convenience and excellent service. About Lexicon Diamond Burs: Stainless Steel Diamond coating reduces gouging Tip matches round bur sizes for efficient initial penetration (sizes #2, #4, #6) Available in assorted pack (1 each of sizes: #2, #4, #6) Available in 21 mm length Available in 3 packs