Featuring a 48mm French Presta valve stem, this Vee Tire 20x1 3/8 FV Bicycle Tire Inner Tube will fit a 20x1.38 bicycle tire. These tubes are made with high quality butyl rubber, making them resistant to ozone cracking and dry rot. Vee Tire Co. inner tubes are handmade in the Vee Tire Co. factory using premium materials. Every single tube that comes off the assembly line is inflated and inspected before boxing for delivery. We take pride in knowing that the hands-on approach ensures the highest quality standards for all our consumers. Vee Tire has been a leading manufacturer of high-quality bicycle tires and tubes since 1977. Produced in Thailand, each of their products are carefully crafted with select raw materials using state of the art modern technologies giving Vee Tire a leading edge over the cheaper low-cost products on the market. Ride with confidence and Ride Safe with Vee Tire!