These are Tosa hand-forged needles. They are handmade. They are tin-plated and have a single hook. Tankichi Fishing Hooks has a tradition of over 240 years since its founding in 1781 (Tenmei 1), and specializes in the forging, hand-forging, and handcrafting of fishing hooks, just like Japanese swords. It is the world's oldest fishing hook manufacturer.