I bought this in 3 colors...we do crossword puzzles a lot. One is for home, one
is for travel, and the other...just in case. The refills are obviously for when
we wear it down. These allow you to be very precise in your erasures and are less frustrating
than the larger, round ones. The click mechanism also seems to work a bit
better than the round one. Best of all, they do not roll anywhere... I expect them to last a long while. Highly recommended if you need a pencil eraser.