Susan Bates Silvalume Crochet 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. Each size is color coded so you can find the size you need at a glance. Our famous in line head helps reduce wrist motion for fatigue free crocheting and helps you maintain a more consistent gauge. This set contains four, 5 1/2" hooks, in sizes C/2 (2.75 mm), D/3 (3.25 mm), E/4 (3.5 mm) and F/5 (3.75 mm).