High-quality materials and durable construction: The main body is made of EVA and high-strength PVC, integrally molded. The rollers are sturdy, have a high load-bearing capacity, and prevent deformation during use. The hollow design allows for a lightweight design of approximately 0.8 kg while maintaining excellent support. It balances portability and durability, has a long lifespan, and can be used for a long time. Standard 33cm size and portability: The 33cm fixed size is convenient to hold and store. It doesn't take up space in any situation, whether at home, in the gym, or on the go. The lightweight design makes it easy to carry, and it can be used by both men and women. It supports relaxation for various muscles, regardless of height or situation. Wolf tooth-like protrusions and relaxation effects: The surface has wolf tooth-like protrusions, and by rotating or pressing, they accurately stimulate muscle groups, effectively relieving muscle tension and pain. By relaxing the muscles of various parts of the body, such as the back, waist, legs, buttocks, and soles of the feet, it loosens the fascia and promotes muscle recovery. Suitable for post-exercise and post-training daily fatigue recovery. Wide range of uses: Use it as a muscle relaxation machine after exercise to relieve muscle tension. As a yoga aid, it supports balance, stretching, and other training. It can be used at home for relaxation, promoting blood circulation, and alleviating muscle discomfort caused by prolonged sitting. It combines relaxation and training functions, enhancing the training experience and comfort.