Package Content: You will receive 2 pieces of castor oil packs for knees with the size of 33x16cm/13x6.3 inch, and the length of the elastic band is 19cm/7.5 inch. The package doesn't include castor oil. Comfortable Material: Our castor oil pack wrap is made of organic cotton, which is skin-friendly, and machine washable. The outer layeris made of TPU (thermoplastic polyurethane), waterproof and oil-proof materials help prevent oil leakage. The inner layer is made of soft flannel fabric that is absorbent and helps the castor oil penetrate the skin. Adjustable Elastic Straps: The castor oil bag has adjustable elastic straps to customize it to your knee size. Featuring an ergonomically designed elastic strap and soft lining, which can comfortably wraps around your leg or knee. Reusable: Castor oil packs for knee can be reused and washed many times, durable, and are easy to use. They can fully absorb castor oil and provide you better user experience. Wide Application: Our castor oil packs for knees can become a great gift for your family or friends at their birthday, festival, party, anniversary, etc.