SET OF FOUR (4) Air Loc Brand Tire Inner Tubes with TR13 Rubber Valve Stem (2 of 6") & (2 of 8") inch Combination Sizes 2 ea. 15x6.00-6 and 2ea. 18/20x8.50/9.50/10-8 Special Combination 4 Tube Lawn Mover Tube Listing 2 front 2 rear Fits Front Sizes: 6" 15x6.00-6 (qty2) Fits Rear Sizes: 8" 18x8.50-8 or 18x9.50-8 or 20x8-8 or 20x10-8 (qty 2) Total 4 tubes with free shipping Tube has Standard TR13 valve stem: Straight rubber valve, the most common stem