Features: Brand new and high quality Made of high-quality material, lightweight and durable to use. Optional 22mm, 25mm inner diameter. Wheelchain anti-tip, prvention of backward rollver assisted uphill. Perfect for electrical power wheelchairs. Wonderful gift for good friend,boyfriend, husband, father,son and yourself. Specifications: Material: Plastic and fiber Color: Red Optional Size:app. 22mm inner diameter,25mm inner diameter Quantity: 1pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-2cm error due to manual measurement. make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1pc Anti-Rollover WheelChair Assisstant Wheel for Electrical Power Wheelchairs