Velocity Boxing Pro Striker MMA Sport Freestanding Strike Punching Bag w/ Tough Durable Bag, Weighted Base, Height 64" Velocity Boxing Pro Striker MMA Sport Freestanding Strike Punching Bag Tough Durable Inflatable Bag with Heavy Duty Bladder & Durable Nylon Outer Cover Designed for the Toughest Workouts Each Half Base Can Be Filled with 37 Lbs. of Sand or Water for Maximum Stability Perfect for Any Athlete Looking to Build Cardio, Improve Speed & Timing, & Hand-Eye Coordination Approx. Height: 64", Approx. Base Diameter: 19"