This pair of Stan's Universal valve stems are used in the conversion of road or mountain rims to tubeless in conjunction with Stan's rim tape (sold separately). These valves will seal most existing rims with inner valve stem hole 6mm-8mm. Rims with no inner spoke holes (like Mavic Ksyriums for example) will not require the yellow spoke tape just the valve stems. Deep dish rims will require a valve stem extender. These valve stems features a removable valve core which allows for application of NoTubes tire sealant.