1. Material: This product is made of EVA and TPE materials. It has a soft and elastic texture, strong support, and can ensure a comfortable user experience. 2. Massage particles: The product is designed with 109 massage bumps, which have an extremely comfortable touch and can effectively relieve pain. 3. Ergonomic angles: The design with 26 angles makes it fit the curve of the human back and waist, maximizing the massage effect. 4. Strong load - bearing capacity: This stretcher is durable and can bear a weight of 100 kilograms. It is not easy to break and has a long - lasting design. 5. Wide application: Don't just use this mat as a post - exercise stretcher. It can also be used in daily life. With its unique design, it can easily be used as a seat cushion to protect your back while you work. 6. Specification parameters: - Color: Multiple colors - Material: PE - Size: Approximately 31*25*10.5 cm/12.20*9.84*4.13 inches 7. Precautions: - Due to different resolutions, there may be slight color distortion. - Due to different manual measurement methods, there may be slight errors. 8. Package contents: - 1 neck and back stretcher