SUSAN BATES-Silvalume crochet Hooks. These hooks have the broadest size range within the Susan Bates family of hooks. Made of lightweight aluminum; each Silvalume hook undergoes a special anodizing process that 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 US and metric sizes are clearly marked on the knob. This hook has a 22in flexible cable; which aids in working a large number of stitches. Imported.