The Fitness Mad Duo Ab Wheel is a great addition to your training kit to Build your core and develop your abs. Providing greater stability with a two wheeled design, ergonomic grip handles and the ability to workout on any smooth floor. Lightweight and portable - the perfect size to fit into your gym bag. Dimensions:40cm (W). Caution: This product should not be used by those with shoulder, neck, back or abdominal conditions or when pregnant. Keep device away from children. Always check with your Doctor before starting a new exercise regime.