ResultSport Double Abdominal Exercise Roller Wheel with Knee Pad Perfect floor based workout tool for strengthening, toning and building muscle in the shoulders, arms, back and abdominals. Lightweight yet robust black PVC plastic construction - makes it very safe to use and easy to transport so you can use it wherever and whenever you like! Even works the lower ab muscles - well known for being tricky to target. Comes with two large (18.5cm) easy-glide wheels for a smooth roll Comes with a knee pad and features foam padded handles for maximal comfort and stability when you roll.