SET OF FOUR (4) Air Loc Brand Tire Inner Tubes with TR13 Rubber Valve Stem (2 of 8") & (2 of 12") inch Combination Sizes 2 ea. 16x6.50/7.50-8 2ea 23x8.50/9.50/10.50-12 Special Combination 4 Tube Lawn Mover Tube Listing 2 front 2 rear Fits Front Sizes: 8" Multi Size 16x6.50/7.50-8 (qty2) Fits Rear Sizes: 12" Multi Size 23x8.50/9.50/10.50-12 (qty 2) Total 4 tubes with free shipping Tube has Standard TR13 valve stem: Straight rubber valve, the most common stem