• Thickened 20-inch inner tube (20x3.0/3.5) with AV32mm valve, compatible with electric bicycle tires. • Made of high-quality butyl rubber, ensures good airtightness, heat resistance, and long durability. • Its robust design improves the ductility of the tire and expands the range of application for heavy loads. • Excellent shock absorption capacity, reduces vibrations and improves the riding experience on uneven surfaces. • Easy installation and removal; it is recommended to check the valve position before installing. • Before installation, it is advised to submerge the tube in water to check for possible leaks. • Avoid contact with sharp objects to prevent punctures.