SPECS: Adjustable 5' to 7' height Sturdy steel frame Base can be filled with 140 lbs. of water or sand for stability TECHNOLOGY: Free-standing reflex punching bag Incorporates a 360-degree rotating boxing bar Made for faster speeds and and more benefits for competitive athletes and fitness enthusiasts Convenient to place wherever you need it most Foam filled and ready right out of the box Lightning-fast rapid-rebound spring ASSEMBLY: Free-standing and easy to move Requires no inflation Ready right out of the box