Heelys Pair of Replacement Wheels Wheel Kit Black/Red Swirl, Medium

If you look inside the empty wheel cavity the wheel cavity is the hole on the bottom of the shoe where you normally insert your wheel and/or plugs, you'll find the type and size of wheel/plug that your shoe uses imprinted inside the wheel cavity. For example, if it reads 'FATS-L US 9-12', you will need to order FATS wheels and/or plugs in a size LARGE, which fits shoes in US sizes 9 through 12. Please note: If the imprint only shows a size Small, Medium or Large, you will need the FATS style in the stated size.