These hooks have the biggest size range in the Susan Bates label. 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. The famous in-line head helps reduce wrist motion for fatigue-free crocheting and helps maintain a more consistent gauge. Set includes 3 hooks in sizes C2/2.75mm, D3/3.25mm and E4/3.5mm.