'If you want to add your name to the waiting list, Hermione, it's five Galleons for your Basic Blaze box and twenty for the Deflagration Deluxe…'
-- Fred Weasley (OP28)
A deluxe set of fireworks containing Weasley’s Wildfire Whizbangs. Cost is twenty Galleons (OP28). The Twins used their entire supply to disrupt class on the first day that Umbridge was Headmistress.
from Latin deflagrationem "a burning up, conflagration"