The Specialized Turbo 700×18/25 Extra Long Valve Tube, with new patent-pending valve and valve base, is proven in rolling resistance testing to reduce drag by as much as 13% per wheel. Large base prevents wear and tear on the rim-to-valve interface. Threading only at bottom half of valve stem allows secure fit to rim. Talc in the pack for a better ride and fewer flats. 60mm Long Valve.