Motolis Tire Tubes Motolis standard tire tubes, crafted from 100 premium butyl rubber and boasting a robust 2mm thickness, offer exceptional puncture resistance and long-lasting durability. These tubes are designed to retain air pressure efficiently, featuring a high-quality air valve for a reliable air seal. If you're looking for dependable protection against flats, these tubes ensure durability and performance. Features: 100 butyl rubber 2mm thick for superior flat resistance Removable valve core Valve Stem Types: Tr-4 - Straight metal stem (8mm diameter) Tr-13 - Straight rubber stem (11.5mm diameter) Js-87C - Tall 90 o metal stem (10mm diameter)