Gaiam Essentials Ab Roller Wheel + Knee Pad, Abs Exercise Equipment Trainer with Comfort Grip Handles & Large Non Skid… $19.48 Make sure this fits by entering your model number. AB ROLLER WHEEL: Exercise roller is equipped with sure-grip handles and a large non slip wheel, as well as a knee pad with a carrying handle built in for a quick and easy abs workout just about anywhere POWER ROLLE: Ab wheel features a perfectly smooth rolling glide for an effective crunch and core abdominal workout