YISMEET Dual Ab Power Wheel/Non-Skid Exercise Toning Wheels, Flawless Fitness Roller Abdominal Exercise Equipment, Best Sport Fitness Workout for Abs, Core and Abdominal Trainers Two non-skid wheels: Ab power two non-skid wheels for added stability & extended time periods of use & it helps decrease your risk of muscular injury Humanized handles design: Contoured grip handles to prevent slippage and extra comfort and grip, easy to use and convenient to store or travel with Highest quality parts: Stylish smooth turning dual matt black plastic roller wheels with axle Build muscle: The dual abdominal roller wheel provides one of the best core and upper body toning exercises