Because of slow sinking, you can control both the surface and the underwater surface at will.
"Rock flat has a slow sinking specification. If you move it quickly, you can use the surface layer as a top water plug, and if you slow it down, you can carefully approach just below the water surface. It can be used in various ways depending on the field situation and the user's intention. That is the big weapon of Rock Flat.”
Specifications that jump out to the water surface during high-speed retrieves and long jerks
"Although it is a sinking type lure, when you increase the speed, it jumps out of the water surface like a real bait and can be lured out with the top. Compared to top water plugs of the same size, it has a moderate specific gravity, so it is difficult to be repelled. Points are also advantageous.”