The body roll and sonic body sound is a feature unique to the ECOGEAR SHAD. The special body design makes the lure achieve the maximum vibration in the water at the slowest retrieval speed. It is designed to suit a wide range from the no sinker rig to heavy weight jig head such as 1/4 oz - 2 oz IWASHI jig head or 3-D jig head. It swims well on the surface with the no sinker rig for sight fishing and it is easy to make a long cast due to the special ECOGEAR heavy soft plastic material and center of gravity of the lure design. 4inch; and 5inch; models are of regular material, 3inch; and 6inch ; are of natural sinking material for a further casting.