Yarie, a hook manufacturer in Japan, MK Hooks are specifically designed for trout fishing.
This MK Hook Hyper 729 is for spoons, with medium heavy wire, and barb-less to penetrate without friction. Recommended for up to 3kg/4lb fish, with 4-8lb test mono lines. Made in Japan
Suites the best for 3g or heavier #4, 2-3g #6.