Designed for comfort, Silvalume crochet hooks feature an exclusive in-line crochet hook, which helps reduce wrist motion and helps you maintain a consistent gauge. The special anodizing process etches away surface impurities, leaving behind a velvety smooth aluminum surface in buttery-soft colors. Contents: 3.75 mm / F-5 4.0 mm / G-6 5.0 mm / H-8 5.5 mm / I-9 6.0 mm / J-10 6.5 mm / K-10.5