The Filamental is a community-created miscellaneous item for the Pyro. It is a glowing lightbulb, complete with a filament, that replaces the Pyro's default mask. It is a robotized version of the Apparition's Aspect.
- The Filamental was added to the game.
- Fixed The Filamental displaying the burning material in DirectX8.
- Items such as the Sight for Sore Eyes and the Professor Speks occasionally render as invisible when worn with this item.
- The item's description references Clairol hair product's advertising slogan "Only her hairdresser knows for sure."
- The item's name is a portmanteau of the words "filament" and "mental".