Features- Gallant Abs Wheel Roller Premium Quality Exercise Fitness Wheels- Targets your abdominal muscle in simple and easy forward movement- Dual Core Anti Slip Wheels allow balanced and stable motion- Help tone Abdominal、 Arms、 Shoulder、 Back and Chest- Thick Padded Foam Knee Mat provides comfort and support to knee's- Made from robust plastic for long lasting use- Lightweight、 Portable and Easy to use at home or gym- Full body workout to burn excess calories- Available in Black、 Pink、 Blue and Red Colour with Knee Mat. Description:100% Brand new and high quality. Color: Yellow/Blue Wheel Diameter: Approx. 6.9 inch / 17.5cm Shaft Length: Approx. 9.85 inch / 25cm Material: Plastic、 steel and foam