1[20x4.0 Bike Inner Tube] Specifically designed for 20x4.0 tires, this bike inner tube ensures a perfect fit and optimal performance. 2[Butyl Rubber] Crafted with premium butyl rubber, this inner tube offers excellent sealing properties, ozone resistance, aging resistance, shock absorption, and electrical insulation. 3[Safe Riding] The butyl rubber inner tube absorbs the impact of uneven roads, providing a comfortable and safe riding experience, even on rugged terrains. 4[Long Lasting With excellent heat resistance, wear and tear resistance, this inner tube can withstand the daily use, ensuring lasting durability and reliability. 5[Versatile Application] Suitable for beach bikes, snowmobiles, and ATV bikes, this inner tube is designed to meet the needs of various outdoor activities.