Works with many hand trucks, dollies, lawn mowers, wheelbarrows, and scooters that use a 4 inch rim wheel Inflatable inner tube with TR87 bent valve stem and a cap Extra secure welded seams, high puncture resistance Inner tube comes with bent air valve, it is recommended to make the valve towards the outside when installation, which can be convenient to inflate. Material:rubber colour:Black Package Contents: 2 * 2.50-4 inner tube Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.