I commented on these "see through" mouthpieces many years ago (those who feel so inclined may look up my exact words in the archive) - For those who can't be bothered, (which includes me) I re-iterate what I said then: A friend of mine bought one of these perspex mouthpieces so that he could see what his pupils were doing. It was very expensive and was a copy of a Paxman mouthpiece. As a teaching aid it was entirely successful right up until the moment he tried to use it at which point, condensation (or maybe spit) formed on the inside of the mouthpiece rendering it completely opaque. He now has it drilled with a hole and uses it as a keyring. Cheers, Larence lawrenceyates.co.uk
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