Product advantage: Compared with other rubber tires, Aloskart electric scooter tires have good shock absorption effect and double thickness anti-skid effect. The design guarantees flexibility and cushioning capacity to withstand all pressure changes. It's stronger, more comfortable, and the perfect replacement for old or broken tires on your M365 scooter. Stable performance: Aloskart upgraded thickened 21.5 cm (8.5 inches) scooter tires, extremely wear-resistant, scratch-resistant, durable, and have high-quality valves that can withstand more pressure. High Quality Material - The scooter wheels are made of high quality butyl rubber. It has good resistance to penetration, mineral acids and aging as well as high abrasion resistance. Butyl rubber guarantees incredible resistance to extreme temperatures (-60C to 180C) for even greater protection. Easy to Install The electric scooter spare tire is very convenient and easy to install and remove. Check the position of the valve and make sure it is installed in the correct orientation. Before assembly, put the inner tube in water to check whether the inner tube is completely sealed. If air bubbles form, they are damaged. Package: 2 inner tubes or one set of inner tubes. 21.5cm (8 1/2 inches) x 2 inner tubes fit for Xiaomi Mijia M365/1S/PRO and other 21.5cm electric scooters pneumatic tires. Please be sure to confirm size and compatibility before ordering. Color: Black