**The Double Wheel Exerciser Features Two Non- Skid Wheels Welded To A Handle. **This Design Grants Extra Safety And Stability, Compared To Balancing On One-Wheel Exercisers. **The Anti-Slip Grips Are Made Of High Quality Rubber Which Ensures The Sturdiest Grip During Workout. ** This Wheel Exerciser Helps You Strengthen Every Upper Body Muscle Group, Including Shoulders, Arms, Back, Waistline And Abs.