1/4" thick and either 1" or 1 1/8" diameters. - Hard sole leather that can be shaped to fit your needs. You can knife edge, square, or bevel to suit your carving.
1/8" thick and either 1" or 1 1/8" diameters. - LIke belt leather, these are slightly softer and conform to your carving to work fast in the polishing steps.
1/8" x 1" Hard Leather - Softer than sole leather but faster than belt leather.