Perfect offense and defensewith this all in one training device. Its unique design simulates incoming punches, forcing the boxer to slip , block, or move. A recessed, nylon handle on the back end allows a coach to control its movement and get a first person view of the athletes form. Its ideal for developing timing and counter punch techniques. At 40-Pound it packs enough weight to absorb solid punching. It is made of durable synthetic leather with four hinged hanging straps made of nylon for consistant movement.