Pentel makes the only erasers (that I know of) that last for years without hardening (like pink pencil erasers) or getting gummy or greasy (like my mechanical pencils). I keep them at my desk, in the kitchen, at work, etc. I sometimes use them for cleaning electrical switch or battery contacts, too. Tip: If you pull off the rubber finger grip, you can see that there's a tab that you can squeeze to keep the eraser from pushing back inside the body while you're erasing.
Rating: [5 of 5 Stars!]