Titanium carbide differs considerably from other carbides, and is the ideal material for resizing cartridge cases. Titanium carbide has the highest hardness of any readily available carbide. The difference is in the microstructure. Viewed under a microscope it appears smooth and rounded, which presents a slippery non-galling surface, ideal for lubeless resizing of cartridges. The Carbide 3-Die set includes the Titanium Carbide sizing die, expander die and bullet seating die with built-in crimp.