Pilot Foam Size 10.
I bought nearly every block eraser that Japan makes in a recent shopping binge.
As a math major, I need lots of erasers as it is, but I also wanted to determine
which ones worked best for my needs. I tested all of the erasers on three
different types of pencils: a Pilot Eno color .7, a Pentel graphite .5 and a
Pentel color 2mm, and then on three different paper types: Rhodia, an index
card, and then plain old American junk copier paper.
The type of paper wound up not mattering with the performance of any of the
erasers. What mattered was what they were erasing.
So with that established:
This eraser is tied with the Sakura Foam eraser as the champion of erasing. The
Pilot takes no prisoners when you put it to paper. If lead is on a page, the
Pilot eraser makes sure that it's not there anymore, with hardly any effort
required. I almost thought I heard it sucking up the lead off the page, even
before I put it to the paper. That's how fierce of an eraser this is.
My first one fell apart because I handled it roughly when I first got it. I
eventually learned that a lighter touch worked as well as murdering the paper
with this eraser, especially.
Please never stop carrying the Pilot foam. In fact, carry the whole line. Pilot
makes bigger eraser sizes than this one.
If Pilot ever makes a click style eraser in their foam line, I'll be buying
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