Velocity Boxing MMA Sport Pro Freestanding Strike Punching Bag w/ Tough Inflatable Bag, Weighted Base, Height 64" Velocity Boxing MMA Sport Pro Freestanding Reflex Punching Bag Polyurethane Foam Reflex Ball, Instant Height & Tension Adjustment Perfect for Any Athlete Looking to Build Cardio, Improve Speed & Timing, & Hand-Eye Coordination Each Half Base Can Be Filled with 37 Lbs. of Sand or Water for Maximum Stability Adjustable Height from 47 to 61", Base Diameter: 19"