Dewalt, 50 Pack, Carbide Utility Blade, Longest Lasting On The Job Site, Improved Durability & Wear Lasts More Than 10 Times Longer, Tungsten Carbide Powder Deposited Through High Powered Laser, Durability & Hardness Is Second Only To Diamond, Carbide Edge Allows Rest Of Blade To Remain Flexible, Carbide Is Much More Brittle Than Steel.