Features: 6/8 inch solid tire, heavy duty, wear-resistant, anti-skid, smooth. High quality metal bearings are used, which are sturdy and durable It is applicable to most electric wheelchairs, carts, front wheels and walking aids. Easy to install and remove. You can roll smoothly on most surfaces. Specifications: Material: Plastic Color: Grey/Black Wheel Size: 15.24cm (6inch)/20.32cm (8inch) Bearing Outer Diameter: 2.2cm/0.87inch Bearing Inner Diameter: 0.8cm/0.31inch Package Includes: 1x Wheelchair Front wheel note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.