SIZE: [4-pack] The replacement inner tubes are for 4.80/4.00-8 inch tires (15.5 inch outer diameter). Please check the size before purchasing. HIGH QUALITY: The tire inner tube is made of isoprene rubber, which improves air tightness and aging resistance. USE: The inner tubes are suitable for garden carts, tractor carts, hand trucks, flatbed carts, wheelbarrows, lawnmowers, etc. EASY INSTALLATION: The heavy-duty inner tubes are easy to install. It probably takes 10 minutes to install the inner tubes. NO special tools required. Color: Black Material: Rubber Package Contents: 4 x Inner Tubes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.