The Eraser is an somewhat uncommon item seen in Nintendo Land: Balloon Trip Breeze.
The item itself is a white rounded eraser in blue packaging with an orange stripe down the middle of the packaging. It is seen in Giant Bubbles, and floats up from the water in some stages.
Function EditErasers simply clear the screen of any Balloon Breakers, even the black type which cannot usually be destroyed. It does not clear enemies, though, and any Balloon Breakers off-screen are unaffected by this item. The effect of this item can also appear occasionally from a Question Mark.