Interchangeable crochet set comes with 6 of the most common sizes: C/2, D/3, E/4, F/5, G/6, and H/8. You can add more sizes (I/9, J/10, K/10.5) later if you want. Ergonomic Rosewood handle is much easier on the hand than the usual skinny hooks. Allows for more time to crochet before hand cramping sets in.