Silvalume Crochet Hook Set. 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 that 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. The 7×3-1/2×1/4in vinyl case is perfect to store your hooks safely. This set includes sizes US F5, G6, H8, I9, J10 and K10.5 (3.75mm, 4mm, 5mm, 5.5mm, 6mm and 6.5mm).