Fat Tire Tube - 20"/26"×4.0"-5.0"Durable fat tire's tube (sold in pair), matching 4. 0" to 5. 0" width fat tires. Hyclines fat bike matching tube is made from premium butyl rubber. these inner tubes provide superior puncture resistance and reliable performance, ensuring a comfortable and worry free ride on any terrain. Our inner tube is designed to improve overall ride quality by providing better shock absorption and tire stability, ensuring a smoother and more enjoyable journey on