I love the Frixion line! I'm glad they finally made the eraser more accessible
with the retractable version (on the OUTSIDE, rather than having to take the cap
off the end while in use). I use these pens to grade papers, so there are no
more "oops" or scratch-outs for me--just a quick erase, and print is gone with
no erasures left behind! Be careful not to leave these pens or anything printed
with them in a hot environment, however, because the ink disappears with heat.
Pop the pen and/or paper in the freezer to restore to original state. It comes
in a great variety of colors, so I never have to worry about confusing my
comments with students', but I'm known for my signature "purple". :) Enjoy!