Rockin' with a set of 8 of those medium ones and am very happy with them. I ordered a set of 3 large ones to try them out on the bigger snakes I got this month. No dice, and sent them right back. It'd be nice if the say it's 3.5 inches high that is really is. The thinest of them couldn't get in the door and the 3.5 inches immediately slopes down to a very small size. Guessing an inch and a quarter. 2 out of the three had edges on them though. None of the medium ones ever have.

Dave