Silvalume Crochet Hooks have the broadest size range within the 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 six, 5 1/2″ hooks, in sizes F/5 (3.75 mm), G/6 (4 mm), H/8 (5 mm), I/9 (5.5 mm), J/10 (6 mm) and K/10 1/2 (6.5 mm).