SIZE: [2-pack] The replacement inner tubes are for 4.80/4.00-8 inch tires (15.5 inch outside diameter ). please check the size before you buy it.HIGH QUALITY: The tire inner tube is made of isoprene rubber which is better in air tightness and aging resistance.USAGE : The tire tubes are usable with garden carts, tractor carts, hand trucks, flat carts , wheelbarrows, mowers etc.EASY INSTALLATION : duty inner tubes are easy to install. It is take probably 10min to install the tire tubes. NO special tools.Colour:blackMaterial:rubberPackage Contents:2 * Inner TubesOnly the above package content, other products are not included.Note: Light 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.