Crimp beads are consistently sized and made from tempered brass to withstand crimping and rounding without cracking. Thet are specifically designed to hold Beadalon bead stringing wire when properly paired and crimped. Available in silver plated, black and gold color in 3 sizes: #1 has a 2 mm diameter, #2 has a 2.5 mm diameter and #3 has a 3 mm diameter.