[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 stores for 8.5 inch 50/75-6.1 tubes with straight valve suitable for front wheel. [THICKENED & PUNCTURE RESISTANT] - Our inner tire adopts a thickened design. Includes 2 pcs 8.5 inch thickened inner tubes for rear wheels. Tubes are 1.9mm thick, offering increased strength and better puncture resistance for longer use. [HIGH-QUALITY MATERIAL] - Electric scooter inner tube is made of high-quality butyl rubber material, providing good thermal stability and air tightness. Material is environmentally friendly. [EXTENDED VALVE] - Designed with an extended valve for easier inflation, allowing more efficient air filling. The curved valve stem helps protect the inner tube during use. [EASY INSTALLATION] - Comes with 2 wrenches to make changing the inner tube more convenient. Color: black. Material: rubber. Package Contents: 2 x inner tubes, 2 x wrenches. Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause slight color variation between the image and actual item. Measurement allowance is +/- 1-3 cm.