The sticky sharpness of Gamakatsu hooks is the result of a patented mechanical needle-honing process developed to make the sharpest hooks possible. And a unique tempering process and high-carbon steel construction ensures superior strength and durability. Per 6. Sizes: 4/0, 5/0, 6/0, 7/0, 8/0. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Hooks.