The answer is 400
the eraser
Both Feather* Eraser (*This is the one I chose)
Their is no record
8 grams
a 1 inch eraser
I would bet on the eraser.
joules
Gram.
A milligram is a measure of mass, not of weight. In any case, the mass or weight depend on the size of the eraser and its colour provides no information in that respect.
Try shaving it back down to size using either a nail file (or knife) under parental supervision!
Unless it's a really big eraser, then yes.