Ab Roller, Core Exercise Stomach Abdominal Power Trainer Spring Back Rolling Abs Gym Fitness Wheel, Resistance Portable… $25.99 Make sure this fits by entering your model number. ★ 【Wide wheel】7 inches Width! Ultra-wide wheels support enhanced balance and stability, avoid wobbly even if rolling out to different directions. Always workout safety first. ★ 【Functional】Automatic spring back/roll back function can protect from pulling muscles, best exercise wheel, more easier for beginners/men/women/teenage.