Pros: Durability, Ease of Use, Effectiveness, Overall Quality
Field Touch Up Stone
This little stone is amazing for putting a razor edge back on a slightly dulled knife. It's very thin, but it's strong enough to carry in the pocket without worrying about snapping it in half. I have a Double Stuff (303MF) and it's great having two grits in one, but I wanted to be able to use both sides of the stones. If you do a lot of touching up in the field before you get home and are able to clean them, I recommend getting a 303F and a 303M separately so you have two surfaces per stone.