Heelys x2 wheelssuitable for all two wheel heelys4 black 2 x 2 wheels 2 x small 2 x mediumabec 3 608 bearingssteel axlessizingsmall medium junior 11 uk 5medium large uk 6to 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 cavity