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🗽【Size】Fat bike inner tubes 20x40/4.5, 32mm (Regular valve), compatible with road bike/mountain bike tire ( ETRTO : 100-406/114-406 ) bicycle tire tubes 🗽【Easy to USE 】The self sealing bike tyre tube is a self-repair for some small holes or very fine cracks. For example, after a long time, some places will leak air quietly, accidentally hit nails and other problems, which are easy to repair. It is worth noting that our self-repairing inner tube can be used normally at room temperature and 0~-15℃, and it is more conducive to travel in cold weather. 🗽【Please Note】As the liquid is fluid, please avoid concentrating the center of gravity or the liquid near the air nozzle during operation to prevent spillage while inflating. 🗽【Safe Bike Tyres】Pre-installed with sealant to provide maximum puncture protection and prevent flat tires on your bike.The self-repairing inner tube is a thicker design, which is more durable than the normal inner tower. The bicycle inner tube rolls through the tire repair liquid to automatically fill the punctured area. After testing, the leak can be repaired within 5-8 seconds under normal conditions. 🗽【Easy to Install】Installing the bicycle tubes is quick and easy. Please follow the inflation guide when inflating a tire from completely flat. Replacing your old tire tubes is hassle-free and can be done within minutes, saving time and ensuring efficiency. 🗽【After-sales Service】If there is any problem about the product, you can contact us, we will try our best to solve for you! 🗽【100% Product Quality Guarantee】We hope to do better in the tire, hope to listen to friends' opinions and suggestions, in order to provide better service and more satisfactory products.If there is any problem on the product within 180 days, you can get in touch with us, and you need to provide evidence pictures and relevant situation descriptions, so that we can respond quickly and save your precious time. We will try our best to satisfy you. Thank you for your trust!