The Carbon Claw Aero AX-5 Series 21-inch is a water filled punching bag designed for all types of fitness workouts, endurance routines, martial arts and combat sports, plus it is excellent for those who want to incorporate a high intensity punching schedule into regular training. The bag offers a realistic body punch sensation thanks to the water filling, which is tightly sealed inside using the NB valve plug and a mix of a special cap with an O-Ring. The bag can be used indoors and outdoors, and it makes a great rehabilitation tool for fighters trying to get back into shape while recovering from an injury. The bag is incredibly robust thanks to the non-degradable, marine grade PVC material, and it is very easy to set up using the moulded hanging eye holes and industrial grade D-Ring.