Self-Starting And Easy To Use :- Built-In Automatic Bouncing Device, One Push And Release, You Can Easily Start, The Strength Is Free To Grasp. Wrist And Forearm Exerciser :- Wrist Force Ball Can Be A Good Exercise For Your Forearm And Wrist Joints, Help To Build Strong Functional Wrist And Forearm, Much Better Than Holding Tight Squeeze. Well Made :- Sturdy Exterior, Rubber Handle, Metal Ball Core, Non-Slip Silicone Edge For Safer. Wrist Cord Protection, Safe And Convenient :- You Can Use The Wrist Strength Ball In A Variety Of Occasions Such As Watching Tv, Walking, Traveling, Arm Exercise, Wrist Recovery, Etc. Please Wear A Special Wrist Cord When Playing To Prevent Excessive Force And Throw Out; Hand Grip Is Moderate In Size And Easy To Carry. Suitable For People Sports Enthusiasts :- Through The Wrist Ball Exercise To Make It More Tension And More Powerful; Office Workers - Through The Wrist Ball Exercise Can Be Away From Sub-Health Or Ease The Discomfort Brought By The Mouse Hand; Students-To Promote Bone Development, Enhance Grip Strength, Wrist Strength, Arm Strength And Finger Flexibility; Wrist Injuries - Through The Wrist Ball Exercise To Speed Up The Flexibility Of The Healing Hand Injury.