Rubber Master Brand Tube Set of 2 Tire Inner Tubes with TR13 rubber valve stems - 8 inch Combination Size Fits 4.00-8, 400-8, 4.80-8, 480-8, 4.00x8, 4.80x8 Fits Sizes: 4.00-8, 400-8, 4.80-8, 480-8, 4.00x8, 4.80x8 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"