Attention all lefties who have felt the pain of pencil graphite smudging across the page, or ink stained hands from erasable pens. These pens are the cure. Doesn't smudge, and is erasable... well actually the ink isn't erased... here the geek moment... it disappears. The friction of the eraser nub heats the thermal ink, which then disappears. No rubbed raw paper, or eraser bits. This the the crown jewel of my stationary kingdom.