A. This inner tube is made of isobutylene isoprene rubber, which has better air tightness, elastic damping, and anti-aging performance than natural rubber. It is not a retreaded tire. B. It is a heavy-duty inner tube, equipped with a TR87 bent valve stem. The maximum inflation pressure is about 30 pounds per square inch (PSI). It is recommended to use a manual air pump for inflation. C. The 4.10 3.50 - 4 inch inner tube is suitable for various vehicles such as wheelbarrows, shopping carts, garden carts, lawn carts, multi-purpose carts, flatbed trucks, lawn mowers, small tractors, wheelbarrows, garden trailers, freight vehicles, generators, snow blowers, and most vehicles with the 410 / 350 - 4 specification. D. It fits 4.10 / 3.50 - 4 inch tires/wheels well and can be used to replace 4.10 / 3.50 - 4 tires/wheels (with an outer diameter of about 10 inches). It can also be labeled as 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, 4.10/350 - 4, 4.10/350 - 4 inches, 4.10x3.50 - 4 inches. E. Customer satisfaction tip: Before installation, it is advisable to check if the inner tube is completely sealed in the packaging. F. Features: Inflatable. G. Valve stem: Oblique rod TR87. H. Number of plies: 4 plies. I. Maximum inflation pressure: about 30 pounds per square inch (PSI). J. Compatibility: - Baja Motorsports Dune (DN65) go - kart - Bladez Comp / Bladez Cruz'r / Bladez S - Bladez XTR - HD 550 / Bladez XTR - S 450 / Bladez XTR - 450 / Bladez XTR - S Transport 450 / Bladez Comp 2 / Bladez Comp 450 / Bladez Street 2 / Bladez Street 450 - Carter Turbo Tiger 2403 - EVO Evo2 / EVO Evo2X / EVO EvoL2X / EVO EvoSPX - Assault / Assault Pro - Hoveround Teknique FWD - Manco Bandit 104B - Mongoose Dirt Grinder - PaceSaver Scout Boss 5 / PaceSaver Scout Boss 6 / PaceSaver Scout RF - P3 and RF - P4 - Super Sup er Turbo 1000 Elite / Super Turbo 800 Elite - Scoot 2X (49X) - Venom BMX / Venom PRO - Yerf - Dog 1204 / Yerf - Dog 3101 / Yerf - Dog 3208 K. Color: Black. L. Material: Rubber. M. Dimensions: about 260x85 cm. N. Specification: 4.10 / 3.50 - 4 inches. O. Package contents: 2 inner tubes. P. Only the items in the above packaging are included, and other products are not included. Q. Note: Light exposure and different monitors may cause slight differences between the color of the items in the picture and the actual product. The allowable measurement error is about +/- 1 - 3 cm.