This crochet set contain 100 pieces different knitting tools- aluminum crochet hooks and other knitting accessories. One knitting set meets different needs Besides the crochet hooks, the kit is equipped with other knitting tools- scissors, plastic sewing needles, locking stitch makers, row counter, knitting gauge, measuring tape, stitch holder,etc. All knitting tools are kept in quality leather case, which is easily to carry around and keep, avoiding tool missing and saving your place after finishing knitting Material: Aluminum + Plastic Product Size(approx.): Color Aluminum Crochet Size: (Length: 15CM/5.91in): 2.0mm/0.08in, 2.5mm/0.10in, 3.0mm/0.12in, 3.5mm/0.14in, 4.0mm/0.16in, 4.5mm/0.18in, 5.0mm/0.20in, 5.5mm/0.22in, 6.0mm/0.24in, 6.5mm/0.26in(random delivery in color) Iron crochet size: (length: 12CM/4.72in): 0.6MM/0.24in, 0.75MM/0.03in, 0.85MM/0.03in, 0.9MM/0.04in, 1.0MM/0.39in, 1.1MM/0.4in, 1.25MM/0.05in, 1.4MM/0.06in, 1.50MM/0.06in, 1.60MM/0.06in, 1.75MM/0.07in, 1.90MM/0.07in Package included: 100 x Crochet Hooks Set NOTE:The color difference is hard to avoid in your phone. If you can not accept this little difference, be cautious before you making the orders. thanks for understanding.