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I have a new large wood and glass display case in my house with 80 tuba mouthpieces on display but I am afraid they will tarnish. Is there anything I can put in it so they won't? Thanks for any reply. William.
By the way, I have an antitarnish bag for my tuba but that isn't a solution here because they are on display.

Actually, an antitarnish bag IS a solution if you're willing to sacrifice the bag to line the case.

If you don't want to sacrifice the bag, get a length of Pacific Silvercloth™ from a fabric store. It's what museums use to protect silver items on display. (See also for a followup.) It'll probably cost ~$10-12/yd.

Most of the silverware manufacturers sell an anti-tarnish strip to put in a drawer with the silverware to prevent tarnish. A friend of mine puts them in the gig bag with his silver horns that don't get much use, it seems to work well.

Thanks so much for the great advice.