A. Material: This product is made of EVA and TPE materials. It has a soft and elastic texture, provides relatively strong support, and can offer a comfortable user experience. B. Massage particles: The product is designed with 109 massage bumps, which have a quite comfortable touch and can effectively relieve pain. C. Ergonomic angles: The design with 26 angles allows it to fit the curve of the human back and waist, enhancing the massage effect. D. Strong load - bearing capacity: This stretcher is relatively durable and can bear a weight of around 100 kilograms. It is not prone to breaking and has a long - lasting design. E. Wide application: Don't only use this mat as a post - exercise stretcher. It can also be used in daily life. With its unique design, it can be easily used as a seat cushion to protect your back while working. F. Specification parameters: - Color: Multiple colors - Material: PE - Size: Approximately 31*25*10.5 cm/12.20*9.84*4.13 inches G. Precautions: - Due to different resolutions, there may be some slight color distortion. - Due to different manual measurement methods, there may be some slight errors. H. Package contents: - 1 neck and back stretcher