The Q-Tubes Standard Line Presta Valve tubes feature QBP's widest variety of tube sizes and valve lengths with a proven record of high quality control and consistent availability. Features: .9mm wall thickness Removable Presta valve core Q-Tubes Standard Line packaging features environmentally friendly soy ink printing on recycled cardboard Master Cartons of Q-Tubes Standard Line tubes contain a total of fifty tubes: Five inner cartons of ten individually boxed tubes Specs: ISO Width (mm)54mm Labeled Size27.5 x 20-2.25 ISO Width (mm)57mm ValvePresta Short 32-40mm Weight210g ISO Width (mm)53mm ISO Width (mm)56mm ISO Width (mm)55mm ISO Width (mm)58mm ISO Diameter584 / 650b / 27.5" ISO Width (mm)52mm Wall Thickess.9mm Substitutes: TU6870