INNOVATIVE YOU'VE NEVER SEEN - Exerciser Twister Balls is an innovative workout equipment that strengthens grip, wrists, and forearm muscles with amazing convenience! It is a wrist that can train your forearm muscles without weight discs like wrist rollers. You can perform wrist flexion and extension exercises by using the force of the spring at the center. You can strengthen your wrists and forearms to prevent injuries like golfer's elbow and tennis elbow. ADJUSTABLE RESISTANCE, 4-in-1 RESISTANCE BALLS - Why should you buy multiple bars depending on different intensity? You only need one. Resistance can be adjusted to different levels so that it perfectly suits your level of forearm strength. You just have to turn the resistance control cap. The shorter the cap becomes, the stronger the resistance. Women and seniors can start exercising with the lowest resistance. The highest intensity is strong enough for strong men. , HIGH-QUALITY MATERIALS; SAFE, SOLID STRUCTURE - The body is made of engineering plastic, which has better impact and mechanical strength than regular commodity plastics. The simple interior structure allows it to be used for a long time without breaking. EASY TO USE & PORTABLE - It is portable and easy to use. You can exercise anytime, anywhere. Since it is small and portable, you can exercise anywhere wherever you are. Strengthen your arm while watching TV, or on your desk in the office when you need to stretch your wrists. With Exerciser Twister Balls, you can improve your wrist strength easily and conveniently in . You can perform wrist and elbow exercises. THE BEST PARTNER FOR IMPROVING YOUR ATHLETIC PERFORMANCE - There are many sports where wrist and forearm strength matters, including golf,tennis,badminton,fitness,weightlifting,climbing, yoga, baseball,and Pilates.The listgoes on. If your grip or forearm muscles are weak,it is difficult to perform well in these sports.The first step in overcoming your limits is to train your grip and forearm strength.Use Exerciser Twister Balls and it will maximize your performance in all sports that you love. Product Name:Grip strength trainer balls Product Weight:760 Colour:A:Black-Red Material:ABS+Carbon Steel+Stainless Steel Package Contents: 1 * Grip strength trainer balls Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.