1NON SLIP: Surface is designed with non lip tire texture to ensure a stable grip and non slip. Ring design fits the palm, ergonomic design, balanced force, comfortable grip. 2RECOMMENDED USERS: 7080LB, about 32KG36KG, incremental training, suitable for advanced grip lift, used by high strength of the hand or professional athletes. 3GRIP STRENGTH TRAINING: Double strength in one ring, free switching, meet multiple training needs. Hand exercise ring helps build strength in fingers, hands, wrist and forearms. 4SOFT SILICONE: Hand grip strengthener ring adopts silicone material, safe and odorless, soft and skin friendly, flexible and wea resistant, durable for use. 5PORTABLE DESIGN: Waterproof and easy to clean, simply rinse surface stains. Compact and lightweight, easy to carry, suitable for office, travel, gymnasium, etc.