Features: This grip rings has a double strength selection, allowing you to use the strength of the grip rings horizontally and vertically according to your own needs and training requirements. The suction cup outside the grip rings has an adsorption effect, which not only relieves pressure but also massages the fingers and palms. Durable material: Made of silicone, it has good elasticity and durability, and can withstand long-term use and frequent training. It can be used for various training purposes, such as enhancing hand muscle strength, exercising finger flexibility, rehabilitation therapy, etc., suitable for users with different training needs. Small and lightweight, easy to carry, it can be trained anytimes and anywhere at home, in the offices, or outdoors. Specifications: Material: Silicone Type: Pink 20 to 30LB/Blue 40 to 50LB/GreyColor 60 to 70LB Diameter: 8cm/3.15inch Package Includes: 1x Hand Strengthener Grip Rings note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.