RUIRIO is our brand that focuses on e-bike accessories, To provide the best outdoor cycling experience for riders all over the world. With the business philosophy of customer first Ensure the quality of products Provide you with high quality service. RUIRIO fat bike tube is made from premium butyl rubber.We use carefully selected, premium materials and a technologically advanced manufacturing process to ensure that every tire is high quality and reliable. Inner tube is made of high quality butyl rubber, which has good sealing performance, high temperature resistance, and aging resistance.This tube is built to withstand even the most challenging terrains,tensuring you can enjoy your ride. Two high-quality 20x4.0" tubes with AV35 Schrader valves and two tire levers included. Perfect replacement for 20" fat bike tires, diameters 3.8-4.0 inches.The two tire levers make it easy to replace your tires. Premium butyl rubber: Our inner tube, crafted from High-Quality butyl rubber, offers exceptional wear and puncture resistance, superior anti-skid performance, and remarkable airtightness, elasticity, and resistance to aging. 20x4.0 cycling tire tube suits for 20 inch Fat Bike/Mountain Bike/Electric Bikes Road/MTB/E Bike.