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 includes one pint of tire sealant 2 molded rim strips with removable valve cores 1 10yd roll of nylon spoke tape decal installation instructionsnote features a 44mm presta valve stem