Steve Karroll does offer the same knife in a frame lock version, and a beefy frame lock version. This one is .175" thick so it's beefy enough for me. I can't get the finish to show up better with my camera,it's bead blasted and tumbled but looks like a dark acid wash finish, I like it alot.
The ZipSlip is the lightest knife I own, and with the deep carry clip it just disappears in the pocket. It also has a pretty stout blade for it's size,which I like. The choil has been nice, but I do hold this one differently than my other knives, as I'm only using it to open packages and what not.