Heavy-duty tubes with TR87 curved stems up to 30. Inflate with hand pump only The inner tube is made of isobutylene isoprene rubber, which is better than natural rubber in terms of air tightness, elastic damping and aging resistance. no restatement 4.10 3.50-4 inch inner tubes for wheelbarrows, wheelbarrows, garden carts, garden carts, lawn carts, utility carts, flatbed carts, lawn mowers, small carts, wheelbarrows, yard trailers, wheelbarrows, vans, generators Machines, snow blowers, etc. 410/350-4 wheel applications Customer Satisfaction: To install, check that the inner tubes are completely sealed by running water, if so, they are damaged. There are separate terms for sales from abroad that may differ from your local, including fit, age rating, product language, labeling or instructions. Size 4.10/3.50-4 Rim size 4 inches Item dimensions L x W x H 25 x 21 x 5 cm Item weight 389.5 grams