1. Applicable quantity: Rehabilitation training for middleaged and elderly people with wrist injuries and hand function problems. (Applicable to adults and children over 7 years old). It is used in the middle and late phase of rehabilitation. 2. Adjustable strength: There are several Thooks in the middle of the product. The more hooks connected to the elastic band, the greater the force for hand rotation and vice versa. Increase or decrease the number of rubber strap hooks to adjust the strength of the product. The operation is simple and convenient. 3. Elastic rubber band: The rubber band is durable and elastic. Training should be done gradually. 4. Made of ABS plastic, durable, good toughness, light weight, no harmful substances.