Fly Down the Road in Osiris' Finest If you've always dreamed of piloting a Firefly-class transport ship, we can help you get one step closer with the Engineered by Firefly bumper sticker. Printed directly from the original file used to create the screen-used prop, the sticker is a replica of the builder plaque seen on the bridge of Serenity in the TV show, Firefly. The sticker measures 5" x 2.5" -- a 1:1 scale replica of the original prop. Printed on silver vinyl, the all-weather Engineered by Firefly bumper sticker is suitable for indoor and outdoor use. So try one on and travel the Verse. Because your other car is, well, just a car.