The MB1 Semi-Long is a metal jig that is highly effective when used in situations where small baits such as sardines and sand lances are densely packed under the water surface, and when luring fish in a bait ball under the water surface. Its perfectly symmetrical form, which produces the same action when jerking or falling, makes it easy to cut into the school of bait with its head in either direction, and lures fish with a half slide at a medium distance. The four sides, which appear different, flash continuously when cast flat, and the narrow form is thin and heavy due to its volume compared to its length, making it effective for catching small baits. It is more effective in close combat with the target close by than in fishing that explores a wide area.