Tube AUTHOR 700x35/50C . 100% all butyl rubber made with extremely air-tight. Keep air pressure in bicycle tyre longer than cheaper tubes made of syntehtic rubber. Presta valve 40 mm. Less air loss = having to inflate less. 100% quality control, each AUTHOR tube is individually examined at the factory to ensue air-tightness. ETRTO 35/50-622/635. # inner tube FVwhere to buyphotogalleryproduct options Photogallery Product options black700x35/50C = UA#37238211