You can't really always...
You can't really always fully use the 28 corners of this eraser until its gone
because of 2 reasons:
1) You will never be able to erase with the inside corners on this eraser.
2) How many corners do you still have after erasing once? (about 24-27 depending
on how/what you erase)
Did i think it was worth $3.25? Eh, not really..Would've said YES if i was
actually able to fully use the 28 corners that the maker hoped it would
PHYSICALLY have after my reasonings
...and oh yeah, white erasers tend to get dirty without covers and make paper
dirty when erasing
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