Lee Precision Carbide Sizing Dies use a solid carbide insert which is ground to a special contour that doesn't leave the objectionable belt mark on your cases so common with ordinary carbide dies. No case lube is required with Lee Precision Carbide Sizing Dies.
Carbide dies from Lee Precision are used in commercial loading machines that cycle four to five thousand times per hour. You cannot wear them out with personal use. Simply the best way to resize straight walled handgun cartridges.