These hooks offer a warm, lightweight and inexpensive alternative to aluminum. Luxite is a specially formulated plastic material that is very durable. Our famous in line head helps reduce wrist motion for fatigue free crocheting and helps you maintain a more consistent gauge. This 5.5-in. set includes sizes US F5, G6, H8, I9, J10 and K10.5 (3.75mm, 4mm, 5mm, 5.5mm, 6mm, and 6.5mm).