These hooks are beautifully colored translucent plastic crochet hooks. Each fun color is a size so you can find the size you need at a glance. Its famous in line head helps reduce wrist motion for fatigue-free crocheting and helps you maintain a more consistent gauge. The 7 x 3-1/2 x 1/4 in. vinyl case is perfect to store your hooks safely. This set includes sizes US G6, H8, I9, J10, and K10.5 (4mm, 5mm, 5.5mm, 6mm, and 6.5mm).