Stans No Tubes Tubeless Valve Stems Presta Valve in multiple colors and widths. Bicycle Tubeless Technology from Sprocket KingsTubeless valves and parts designed after years of experience with ideal and less than ideal rim and tire combinationsTubeless valves provide an airtight seal on most Presta valve rimsRemovable valve core for sealant installationColor options available:No Color - 35mm, 44mm, 55mmBlack - 35mm, 44mmOrange - 35mm, 44mmRed - 35mm, 44mmBlue - 35mm, 44mmGreen - 35mm, 44mmCheck out some other great products from Stans No Tube