Tinksky 9pcs Assorted Single-head Plastic Crochet Hooks Knitting Needles in Different Sizes (3.0mm to 12.0mm) 9 pieces of the single-head plastic rochet hooks in different sizes in one set will be sold together. Material: durable hard plastic. Each hook length: about 15cm Crochet hook size: 9 different sizes, including 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10.0mm, 12.0mm. The more you knit with them, the more you will love to knit. Lightweight design, easy and comfortable to use.