Susan Bates Silvalume Afghan Crochet Hooks are made of lightweight aluminum. Each Silvalume hook undergoes a special anodizing process, which etches away all surface impurities. In addition, each hook is heat treated for strength and durability and polished for a velvety smooth finish. Each size is color coded so you can find the size you need at a glance and the U.S. and metric sizes are clearly marked on the knob. These hooks have an extended shaft, which aids in working afghan and Tunisian stitches. This package contains one 10" hook.