RCBS Carbide Pistol Reloading Die Set - The Tungsten Carbide die set eliminates the need for case lube and the cases do not need to be cleaned prior sizing. 3 Die Sets include a Carbide Sizer Die with Decapping Unit, an Expander. Tungsten Carbide die set eliminates the need for case lube3 Dies including sizing, mouth expander, and seating dies.