Heelys single wheels fats abec 1pair of replacement wheels for heelys skate shoesmade to fit any heelys skates that use a fats wheelhigh performance polyurethane fats wheels with steel axlesabec 1 bearingsavailable in multiple sizesto find the correct size to order look inside the empty wheel cavity the wheel cavity is the hole on the bottom of the shoe where you normally insert your wheel andor plugs you39ll find the size of wheelplug that your shoe uses imprinted inside the wheel