Main Feature Improved Tubes:(Model: 8 1 / 2x2).Tube is 100% compatible with Xiaomi Electric M365 scooter.The upgrade is thicker and heavier than the original, and thicker (1.6 mm) than the original one (0.9 mm).Compared to solid tires, it has a good damping effect and easier installation. Reinforced valve and tube:Feature a high quality reinforced valve that preserves more pressure and withstand any pressure change.Come with 2 Tire Lever,Easy to Replace Tire. High Quality Material: Our inner tube is made from natural butyl rubber which means they are waterproof,highly resistant to mineral acids,ultra tear-resistant, scratch-resistant and durable in use. Durable Tube: The solid tube has been developed to respond to uneven road conditions, a durable and durable tube over time. It is strongly recommend to wear anti-puncture strips. The tubes are thicker but they are not indestructible. If a tip penetrates your tire, your inner tube can be pierced. Before installing,Wrap the pointed end of the crowbar with fiber cloth so that it will not damage the inner tire and coating of the hub. Specification Material: Butyl Rubber Tube Size: 8 1/2×2 Valve- stem: Straight Weight: 75g/each Package Size: 20 * 20 * 4cm / 7.9 * 7.9 * 1.6in Package List: 2 * Inner Tube Specially designed for compatible with Xiaomi M367 scooter. Shock-absorption and anti-slip. Thicker than original one, so you can get a better cross over ability.