This hose is made of isobutylene isoprene rubber, which has better airtightness, elastic damping and better aging resistance than natural rubber. NO REPEAT Heavy duty tubing with TR87 curved valve stem, 30 PSI max inflation. Inflate with hand pump only 4.10 3.50 to 4 inch air chamber Works on hand truck, dolly, construction truck, garden truck, lawn truck, utility truck, flatbed truck, lawnmower, small tractor, wheelbarrow, garden trailer, cart, cart, generator, snowblowers and most 410/350 4 wheeler (10 OD) applications. also measured in 4.10 3.50-4, 410/350-4, 3.5-4 4, 4.1/3.5 4, 4.10 3.50 4, 4.10 3.50-4, 4.10/3.50-4, 4.10/3.50-4 inch, 4.10 x 3.50- 4 inch CUSTOMER SATISFACTION: Before installation, check whether the pipes are completely sealed by immersing them in water, if there are bubbles, they are already damaged. Note: The data is manual measurement, please Please allow 1-101cm error, due to differences between light and screen, there will be a certain color difference, the