Stan8242s tubeless system converts your existing wheel set to tubeless it allows you to use either standard or tubeless tyres saving hundreds of dollars and weight over purchasing other tubeless systemsthis kit will fit most cyclocross rims 17 to 21mm widethis kit includesone pint of tire sealant2 molded rim strips with removable valve cores1 10yd roll of nylon spoke tapedecalinstallation instructionsnote features a 44mm presta valve stem