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【Ideal Size】Inner tube size of 12×2.125 (12 1/2 x 2 1/4) is perfectly compatible with the front and rear wheels of most electric scooters. 【Package Included】You will get 4 thick air tube and 4 tire pole. The affordable combination of organization helps you change tires quickly. Please confirm the size of the air chamber meets your requirements before purchasing. 【Easy Installation】The replacement air chamber is extremely, convenient and simple to install and disassemble. Reinforced air chambers check the position of the valve and be sure to install it in the right direction. 【High Quality Material】 Scooter inner tube made of high quality butyl rubber. It has good resistance to penetration, air chamber mineral acids and aging with high resistance to mineral acids and wear. 【Wide Compatibility】12 inch reinforced air tubes are fully compatible with the front and rear wheels of most electric scooter, inner tube for 12 inch baby stroller and bicycle.