This is a pair of two (2) new Air-Loc 18x8.50-10, 20x8.00-10, and 20.5x8-10 multi-fitment atv / lawn and garden / golf cart tire inner tubes. They are multi-fit tubes that are made to be used in the following sizes: 18x8.50-10, 20x8-10 and 20.5x8-10. The most common applications are for atv, lawn mower and golf cart tires. This tube has a standard TR13 short rubber valve stem.