Heelys fats heel tool plug setmost fats models come with plugs and tool ideal replacement for lost partsthis set fits all fats models of 1 wheeled heelys apart from models that have the mega wheelsize guidesmall junior uk 11 uk 5medium uk 6 7largeuk 8 11to 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