[Widely used for REAR WHEEL] - Attention please: Only rear wheels can be used. If you are looking for inner tubes for front wheel, please check our store for 8.5 inch 50/75-6.1 tubes with straight valve suitable for front wheel. [THICKENED & PUNCTURE-RESISTANT] - Our inner tire features a thickened design. Includes 2 pcs 8.5 inch thickened inner tubes for rear wheels. Tires are 1.9mm thick, offering enhanced strength and improved puncture resistance for long-lasting use. [HIGH-QUALITY MATERIAL] - Electric scooter inner tube is made of high-quality butyl rubber material, providing excellent thermal stability and air tightness. The material is environmentally friendly and safe. [EXTENDED VALVE] - Designed with an extended valve for easier inflation, allowing more efficient air filling. The curved valve stem helps protect the inner tube and reduces the risk of damage during use. [EASY INSTALLATION] - Comes with 2 wrenches to make inner tube replacement more convenient. Color: Black Material: Rubber Package Contents: 2 x Inner Tubes 2 x Wrenches Note: The package includes only the items listed above. Other products are not included. Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.