Vanfook, a hook manufacturer in Japan, Expert Hooks are specifically designed for trout fishing.
This SP-31Zero is for small spoons, made of medium wire, barb-less, and its surface is treated with very slippery fluorine resin to remove friction in hooking. Recommended for up to 1kg/2lb fish, with 1-4lb test mono lines. Matches well to spoons of 1.0-1.2g #10, 1.5-2.0g #8, 2.2-3.0 #6. Made in Japan