Material: Made of high quality rubber, durable and suitable for home, commercial, and industrial use. Valve Type: Bent metal stem. 4 Pack wheelbarrow inner tube. 4.10/3.50-4 Replacement Tube: Fits 4.10/3.50-4 inch tires/wheels (10 inch outer diameter). Wide range of applications: Compatible with carts, lawn mowers, hand trucks, utility vehicles, tractors, and trailers. Notice: Inflate only with a hand pump to prevent overfilling. Color: Black Material: Rubber Package Contents: 4 x Hand Truck Inner Tube Note: The package includes only the items listed above; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.