This is a cut vinyl decal of the Altus Metrum logo.
They're approximately 1.5 x 3.75 inches (38 x 95 mm), and look great on airframes, laptop and tablet computers, ground support equipment, etc!
We have these in four colors, all of which are brighter than the photos here in the store show. The holographic ones are sort of shiny and sparkly and tend to reflect whatever color light they're in. We include a holographic decal in all of our Starter Packs, but carry multiple colors so that we can always pick something that contrasts well with whatever the background color is.