Specific hump-backed shape along with a thinner tail allows for maximum forward buoyancy providing optimal swim action. Upper half of body is round while flat belly helps to cut through the water to increase every swimming action. Virtually no sound due to its weight being fixed and not free moving. SL version has a small lip shape and larger angle designed to be a twitch bait for finicky fish and finesse/light tackle action. ML version is designed with a shallower lip angle and will cover most fishing situations. BRL version has a unique depth feature that when retrieved slow the bait will maintain its desired depth, but when retrieved fast will actually become shallow to the point it may break the surface!. LL version is by far the deepest Diver in the market, but has little resistance on the rod tip due to the shape of body and unique gap between bill and body. BRL, and LL larger sizes are built with a full wire reinforced for larger fish.