The first mold has cavities for 1/4, 3/8, 1/2, 5/8, and 3/4 oz jigs. The second has 3/4, 1, 1 1/4, 1 1/2 oz cavities adding even more options. This mold has the exact specifications to the original Yamamoto Senko. For best results, use Do-it Essential Series or Crystal Clear Plastisol.