Nirvana Needle Arts 6" Bone Crochet Hook Set is packaged in a Needle and Hook Case to roll. The crochet hooks are F/3.75 mm; G/4 mm; GH/4.5 mm; H/5 mm; J/6 mm. These are a jewel to own and give as a gift to your favorite crocheter. Hooks have a decorative end - not a toy, but delightful to use. Great color selection for case.