SIZE: [2-pack] The replacement inner tubes are for 4.80/4.00-8″ and 20×8.00-8″ tires (15.5″ outside diameter ). Please check the size before you buy it.The package include 2 compatible 20×8.00-8″ inner tubes. HIGH QUALITY: The 20×8.00-8 lawn mower tire tube is made of isobutylene isoprene rubber which is better in air tightness and aging resistance.In order to avoid the occurrence of flat , the 20×8.00-8 inner tube is uniformly formed by rubber. Please rest assured to use! USAGE : When a 20×8.00-8 tire blowout occurs, there is no need to buy a new wheel. Only need to replace the 20×8.00-8 tube, you can use it normally!The 20×8.00-8 tire inner tubes are usable with garden carts, tractor carts, hand trucks, flat carts , wheelbarrows, mowers etc. EASY INSTALLATION : The heavy duty 20×8.00-8 lawn mower tube are easy to install. It is take probably 10min to install the tire tubes.NO special tools!Avoid overfilling during inflation . PLEASE NOTE: 1 YEAR WARRANTY!Ask