Billy Baits Mister Big lures were designed for REAL high-speed 8 to 20 knot trollers. The 16 oz. head is machine-drilled with eight vent holes, which creates a huge smoke trail. It has internal chambers with stainless steel balls that rattle when trolled. Mister Big is precision machined to exacting tolerances and includes the Billy Baits special 360� turbulence ring.