A pink pen with a red crystal on top. Luna (Sailor Moon) gives this to Usagi so she can don a disguise to infiltrate places she normally cannot access. Sailor Venus uses it once (offscreen) to transform into a mock version of Sailor Moon to trick the enemy in the 90s anime's third season.
Not to be confused with the Transformation Pens that the Inner Senshi use to transform into their Sailor identities.