I had my Evans magnetic drum key for almost a week. I left it on the studio drum set, came back the next day after a late night session and the key was gone. I don't think the drummer intentionally took it, it was just there, he used it and slipped it into his pocket without thinking. I'm going to order several replacements, I like it. It's unique looking so if I see that drummer sporting one of these I'll bet I know where it came from. No worries, that's what running a studio is all about.