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, which etches away all surface impurities. In addition, each hook is heat treated for strength and durability and polished for a velvety smooth finish. These 40in circular hooks have a flexible cable with a hook on each end, which aids in working special stitch techniques with a large number of stitches. Comes in a variety of colors. The color is chosen at random and cannot be selected. Imported.