Made of durable materials which are built to last. Non-slip rubber handle design for better grasp. Compact and portable, you can put in your pocket, handbag, backpack, etc. Adjustable resistance range from 22 to 88 Lbs. Increase your finger strength for bowling, tennis, baseball, volleyball, boxing and more. Perfect hand strengthener for the guitar players, violin, piano, drummers and other musicians or fitness enthusiast.