About this item This fits your . Make sure this fits by entering your model number. 【Easy Rebound】There is a strong spring at the bottom of the shaft, and the sandbag can easily bounce back to its original position after each hit. 【DURABLE MATERIAL】The fitness reflex ball comes with a durable base, sturdy spring and height-adjustable valve for use on various surfaces and is easy to assemble. 【Height Adjustable】The height of the boxing ball rack is adjustable from nearly 27.5-43.3 inches to meet the needs of your whole family. Suitable for veterans and beginners. 【Stable Base】The base can be filled with sand or water, lifting weight, handle design, easy to carry, can be filled with water or sand through the injection hole to improve stability. 【Multifunctional Uses】Sandbags have many benefits and are good for weight loss, stress relief, healthy fitness, exercise response, etc.