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Medical Device Registration Number: 13B2X0018700020 (Herveren knottion) The first joint is red and swelling from the indexing finger to the pinky finger. Sometimes it can cause pain. Sometimes you see on your thumb. The first joint is also poorer. It also makes it difficult to grip harder for pain. You may get a blister-like sheerness near the first joint. About Size Selection: If you are difficult to check the size by wearing it, please measure the circumference of the first joint of your finger with a measuring tape or thread, and choose the size that is close to the width of each product. We recommend a size that is slightly larger than the perimeter of the first joint. Example: For those with a circumference of the first joint is 2.1 inches (53 mm) and the S size (about 2.1 - 0.1 inches (53 + 2 - 3 mm) is recommended size. [How to use] (1) The ring may gradually become addictive and deformed from a round shape. (2) Wrap the ring around the stick to shape it. (3) It can be restored to the original round shape. Precautions for Use: The functionality will deteriorate slightly by bit. Replace it with a new ring when it gets loose. Please purchase a new ring based on 1 to 3 months depending on the frequency of use and use. To ensure that the ring can be used for a long period of time, be sure to minimize the need to open and close the ring. This product is meant to break the joints, so it cannot be fully fixed or corrected joints of deformed joints. If you use your hands while wearing this product, the ring may become loose and easy to fall off. Use it when you can rest your hands as much as possible. Please use under the guidance and guidance of a physician.