These hooks are a lightweight and inexpensive alternative to aluminum. Made from luxite, which is a specially formulated plastic material that is very durable. In-line head helps reduce wrist motion for fatigue-free crocheting, and helps to maintain a more consistent gauge. Includes sizes F/5 (3.75mm), G/6 (4mm), H/8 (5mm), I/9 (5.5mm), J/10 (6mm) and K/10.5 (6.5mm). Each hook measures 5-1/2" long.