The 2 1/2 inch, 1/2 oz Bomber Balsa Model B crankbaits feature traditional balsa wood construction with the new highly advanced Tru-Track™ frame system. The Bomber Tru-Track system is a super tough polycarbonate one-piece frame and paddle that runs through the body of the crankbait. This one piece skeleton is designed with rock solid hook hangers in the belly and tail section with eliminate hook hanger failure - a traditional performance problem with balsa crankbaits.