Good In Use Exercise Ball: The Finger Exerciser Is Good for Sportsman (Rock Climbing, Fitness, Weightlifting, Tennis, Baseball, Boxing, Tennis, Golf, and Shooting) and Music Instrument Player (Guitar Players, Bass Players, Pianists, and Violinists) or The Elderly People To Train The Finger. . Silicone Squeeze Ball Materials: The Finger Strengthener Are Made of Eco-Friendly Premium Silicone That Feels Comfortable When You Do Your Hand Exercise. Stress Balls Are Whippy, Flexible, and Easy To Carry. . Finger Exerciser: Special for The Office Worker Who Often Uses Keyboard and Mouse All Day. It Is Perfect for Your Hand and Finger To Train and Avoid Causing Injury or Pain. You Can Use The Strengthener Ball In Office or Home. . To Relive The Pressure: Drisubt Hand Grip Strengthener Ball Is A Nice Size and Easy To Grip and Train. It Is Good for You To Reduce The Stress In The Busy Life or Boring Life. You Can Use It While Walking, Traveling, In The Office, School, Watching Tv, Phone Calling or Any Place You Want To Exercise.