 Any conditions, you know, sand, anything that can get into your optic that can really cause you problems. And a closed optic is something that really puts you at that level where you don't have to worry about anything. So red dots are really tough, most of them, really tough, really rugged. And we especially build ours. The original premise of this optic came from the Romeo M17, which we developed for the U.S. Army to go on their M17 pistols, M18 pistols. Well, there's the bleed-through now that Ron was talking about. That's fantastic. Now, also, the reticle on this...