Pentel Ain Clic Knock Triangular Eraser with Clip - Metallic Green Body

This is a pretty nice eraser actually, but there's a little bit of false advertising, as the triangular shape does NOT mean that there will always be a sharp point on it - rather, there will always be a sharp LINE, but this is much less precise for fine details than the now-discontinued "Tuff Stuff" eraser. So while not the best for very tiny precision erasing, it's actually very good for a more general usage. The eraser material is gentle but effective.

I keep two mechanical erasers in my pencil case - this one is what I usually use, and the Tuff Stuff for when I need to erase something very precisely.

Nice stick eraser, far superior to any round one I've every tried. It's a little soft for my tastes, but I'm happy with it.