The Vatiz Adjustable Hand Gripper, Double-Spring Version Forearm, wrist and hand strengthener in one contained unit. Different from a wrist and forearm roller but just as effective. 29 adjustable resistance levels from 60 to 390 pounds (27 to 177kg). Very smooth action, feels great in your hands due to brilliant polished finishing with a corrosive-resistant surface. Handles not too rough and not too smooth, just right so it doesn't slip out of your hands.