Air Loc Brand - Set of 2 Tire Inner Tubes with TR13 rubber valve stems - 12 inch Combination Size fits 23x8.50-12, 23x850-12, 23x9.50-12, 23x950-12, 23x10.50-12, 23x1050-12 Lawn and Garden Designed for Mower/Tractor, Lawn and Garden, ATV Fits Sizes: 23x8.50-12, 23x9.50-12. 23x10.50-12 Tubes have Standard TR13 valve stem: Straight rubber valve, the most common stem style, measuring approx. 1.38" long and used in the standard size wheel hole of approx. 1/2"