The Jack Hammer Bag is the ultimate for upper cutting. With a bag being so short, it keeps your under game strong, which is ideal for anyone trying to reach Mike Tyson potential. Sporting a short 500mm in length, this top quality boxing bag will assist with clean curl and snaps! Our bags are made of top quality durable vinyl. They come complete with 4 hanging straps and welded D-Rings. This 0.5m bag is ideal for the youngsters starting out.