I was poking around online today and ran into these... and this video.
http://www.youtube.com/watch?v=GH1po8kP9c8
Really cool video, and really neat product, but it seems that a single clamp costs about $3.00. I'm assuming it's a one time use thing, which makes these very non-economical.
If they were $0.50 a pop I think I'd buy a whole bunch of them.
Looks like they are just really thick heat shrink.

