When you try to pitch a Texas rig into a small spot, or smash through cover such as trash, what stands in your way is the line. The sinker may fall through, but the worm may be left behind on the cover.
This makes your attacking incomplete in many cases.That is where Zappu Sasuteki Weight comes in, which reverses positions of sinker and hook to let the sinker goes into cover pockets first.
With this arrangement, lighter weights can easily slip through heavy trash even where weights over 1oz is needed. Away from trash, direct biting will come that you can catch. Also, the falling is faster than regular Texas rig with the same weight. If you are trying to catch reactions from fish, this will be very effective.