This item is well made of for durable and practical use. Whether you are at home, work, walking, in the car or doing your favorite sport, you can exercise your hands and forearm at anywhere as the rings are lightweight and portable. These are perfect for athletes and musicians for training use. Features - ColorAssorted Color - Material: Silicone. - Size: 7 x 7 x 1.8cm - Made of silicone material, comfortable and durable to use. - Different color rings for different strength to squeeze - Prevent injuries and muscle imbalances from the overuse of "crushing" type hand and exercises. - Gear pattern to prevent slipping while using. With several points, this ring can be used as massager. - Suitable for white-collar worker, teacher, elders, student, and etc. Package list: 1 x 30 LB Ring (Light Green) 1 x 40 LB Ring (Grass Green) 1 x 50 LB Ring (Dark Green)