KnitPro's range of Zing Crochet Hooks are beautifully smooth and come in a broad of range of colour-coded sizes that correspond to the full spectrum of KnitPro's Zing range. That's useful when you're working with different tools, and you need to find the right size quickly. They're made out of superior grade aluminium and have the size, rather helpfully, stamped on the thumb grip.
They're available in 13 sizes from 2mm (A0) to 6mm (J10). They're also available as a super handy set of nine hooks, and you can find that collection here.