【Product Name】: The Back Stretcher is designed to help alleviate back pain, improve posture, and promote overall spinal health. 【Material】: Made from high quality EPP material, this back stretcher is durable and sturdy, ensuring long lasting use. 【Lightweight】: This back stretcher is lightweight and portable. You can easily carry it to your yoga class or anywhere you want for a quick stretch. 【Adjustable】: Adjustable 4-step tensile strength. The surface and bottom groove design of the base allows for easy stacking. 4 height levels can be freely combined to increase or decrease tensile strength. 【Wide Applications】: The back stretcher is widely suitable for home, gym, exercise, yoga, Pilates, fitness, and workout use. Specification: Material: EPP Size: 20cm x 25.9cm / 7.87 inch x 10.20 inch Package Includes: 1 set back stretcher Note: Please allow slight errors due to manual measurement and different monitor displays.