"Fairies can be extremely vain and groom themselves almost constantly: removing a fairy's wings, for example, tends to cause it extreme annoyance."
Zygmunt Budge, Book of Potions[src]

The wings of the fairy are used as an ingredient in the Girding Potion and the Beautification Potion. Removing a fairy's wings is non-fatal, but will cause extreme annoyance to the fairy in question due to the creatures' natural vanity. Because the fairies are very hard to approach and to capture, their wings are considered as precious ingredients.