E.C. Moore Carbide Burs are available with two coatings. The most durable are the E.C. Moore ZrN Zirconium Nitride Carbide Burs. These burs last six to ten times longer than our Regular Carbide Burs. Our GT Series of burs features a Titanium Nitride Coating which extends the life of the bur three to five times longer than conventional Carbide Burs.