[Widely used for REAR WHEEL] - Attention please: These inner tubes are designed for rear wheels only. If you are looking for inner tubes for front wheels, please check our store for 8.5 inch 50/75-6.1 tubes with straight valve suitable for front wheels. [THICKENED & PUNCTURE-RESISTANT] - Our inner tubes feature a thickened design. These 2pcs 8.5 inch thickened inner tubes are intended for rear wheel use. The tubes are 1.9mm thick, offering enhanced strength and improved puncture resistance for extended durability. [HIGH-QUALITY MATERIAL] - Made from high-quality butyl rubber, these electric scooter inner tubes provide excellent thermal stability and air tightness. The material is environmentally friendly and safe. [EXTENDED VALVE] - Designed with an extended valve for easier inflation, allowing for more efficient air filling. The curved valve stem helps protect the inner tube during use, reducing the risk of damage. [EASY INSTALLATION] - For convenient installation and replacement, each set includes 2 inner tubes and 2 wrenches. Color: Black Material: Rubber Package Contents: 2 x Inner Tubes 2 x Wrenches Note: The package includes only the items listed above. Other accessories are not included. Note: Slight color variations may occur due to lighting and display differences. Measurement error is +/- 1-3 cm.