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 8-1/2 x 3-1/2 x 1/2in vinyl case is perfect to store your hooks safely. This set includes sizes US L11, M13, N15, and P16 (8mm, 9mm, 10mm, and 11.5mm).