The SEYOUN 27.5" bicycle inner tube is crafted from natural rubber to provide a reliable seal for your tires. Its reinforced structure is designed to withstand mechanical shocks and compression, which helps you maintain stability during your rides. To ensure a consistent ride, this tube features an optimized design for uniform inflation, a detail highlighted by the green-red graphic markings on its cardboard packaging. Because it fits standard 27.5-inch rims, it is a versatile choice for those using city, folding, or standard bicycles.