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. Our famous in line head helps reduce wrist motion for fatigue free crocheting and helps you maintain a more consistent gauge. Details: Includes assorted sizes 4 hooks Aluminum Contents: US size C2 (2.75 mm) US size D3 (3.25 mm) US size E4 (3.5 mm) US size F5 (3.75 mm)