The Fitness Reflex Bag is perfect for novice boxers or fitness enthusiasts who want to get a great workout, while developing accuracy, timing and distance. Features: Made with durable synthetic leather The bag's height can be easily adjusted between 49" - 69" The plastic base tank can be filled with up to 125 pounds of water or 240 pounds of sand Mimics the movement of an actual opponent via the specifically placed chrome spring Additional Details: