Stretchable cords, also known as TENDONS, are a type of flexible material that can be used for a variety of purposes. They are often used in the medical field to help with physical therapy and rehabilitation, as well as in the construction industry for tying down materials. They are also used in the sports industry for stretching exercises and for providing support and stability during activities. TENDONS are made from a variety of materials, including nylon, polyester, and rubber, and come in a variety of sizes and lengths.