Tube AUTHOR SuperLite 700x18/25C with lover wall thickness. 100% all butyl rubber made with extremely air-tight. Keep air pressure in bicycle tyre longer than cheaper tubes made of synthetic rubber. Less air loss means having to inflate less. Extended French valve 60 mm. Lower wall thickness 0,65 mm – weight 76 g. Less air loss = having to inflate less. 100% quality control, each AUTHOR tube is individually examined at the factory to ensue air-tightness. ETRTO 18/25-622/635. # inner tube FVphotogalleryproduct options Photogallery Product options black700x18/25C = UA#37270202