Best Protection for Grand Piano

For several years now I have been recommending that owners of grand pianos purchase and install a string cover. This is a piece of (preferably wool) material that fits inside the top of the piano completely covering the string and tuning pin area. It keeps out dust, and many other damaging things that shorten the useful life of the piano.

More information at: http://www.angelfire.com/biz6/afinetune

Then click on the link about the Edwards String cover.