Epitomie Fitness BIO Ab Roller Wheel - Ab Carver Exercise Equipment with Fitness Mat to Strengthen Abdominals and Tone Core MAXIMUM STABILITY  The BIO Core is the only ab roller available today that uses RUBBER wheels for maximum stability on any surface. Unlike other ab wheels, you can now train anywhere, even on smooth floors, to tone and build your abs, back, shoulders and arms. BONUS WORKOUT MAT  A high quality knee mat is included in the package along with the abdominal wheel so you can finally say goodbye to bruised knees. The kneeling mat is made from high density EVA foam to provide maximum protection and comfort for your knees. ERGONOMIC PERFORMANCE GRIPS  Thick ergonomically designed memory foam handles have been added the ab wheel to increase grip and overall comfort during workouts and even for prolonged use. Never slip and feel uncomfortable gripping an ab carver again. GREAT FOR ALL FITNESS LEVELS  Utilizing 2 large rubber wheels, the wide and sturdy base of the BIO Core ab carver pro is ideal for smooth silent functioning and improved balance & stability, no matter what your size. Even when used at multiple angles, the ab wheel roller will support large weights of up to 450lbs. LIFETIME REPLACEMENT GUARANTEE  The BIO Core ab roller is the only ab wheel that uses high grade rubber wheels, industrial strength polymers and a stainless steel axle. Were so confident that weve used the highest quality parts possible that we offer a no questions asked life time replacement.