Made of natural rubber material, grooved surface provides excellent grip, robust and durable. 8 1/2x2 (50-134) suitable for electric scooters for Night Series, good for replacing the old or damaged tire. Explosion-proof and pressure-resistant, resistant to abrasion, can be used in snowy and rainy days, offering maximum safety for you. The tire's elastic design has been studied to allow flexibility. The tire can be stretched but it will always return to its shape. Easy to install and remove, flexibly adjusted and tightly fixed. Specification: Material: Natural Rubber Color: Black Model: 8 1/2x2 (50-134) Types: Inner, Outer, Inner and Outer Inner Tire: When inflated, width approx. 3.5 cm-6 cm/1.38-2.36 inches, inner diameter approx. 13 cm-14.5 cm/5.12-5.71 inches, outer diameter approx. 19-23 cm/7.48-9.06 inches (The degree of inflation is determined by your needs, it is recommended not to overinflate) Outer Tire: tire width approx. 5.5 cm/2.17 inches, inner diameter approx. 13.4 cm/5.28 inches, outer diameter approx. 21.59 cm/8.5 inches The model 8 1/2*2 (50-134) is not suitable for Xiaomi electric vehicles. Mainly suitable for children's electric scooters, please confirm the size of your electric scooter before purchasing. Package includes: 1 pc x Inner/Outer Tire Or 1 pc x Inner Tire + 1 pc Outer Tire Note: 1. Not suitable for Xiaomi 365 electric scooter, please confirm the size you need before purchasing. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures. 3. Please allow 1-2 cm differences due to manual measurement.