Readaeer Ab Roller Wheel Abdominal Exercise for Home Gym Fitness EquipmentStrengthen and tone upper abs, shoulder and entire core. The diameter of the ab roller is 6.3 inches. Double non-skid rubber wheels for stability slides across any surface without slipping. Non-slip handles which is made of a combination of hard plastic and softer rubber. Comes with the TPE knee mat. Easy to assemble and portable. QUALITY WARRANTY:3 years. If t is any problem with the quality of the product, please contact with us. Payment DetailsWe currently accept payment via PayPal only. Once payment is cleared, we will dispatch your shipment within 1-3 business days. Please refer to the "Shipping" tab for more information regarding shipping speed to your destination.Return PolicyAs our valued customer, we will do our best to make sure the product you receive arrives to you on time and as expected. If you are not satisfied with your purchase, please contact us within 30 days of receiving your order to process a return.