The Bach Preventative Tarnish Trumpet Bag's preventive storage unit is specially treated to lock out all tarnish causing gases. Just zip instrument in bag and place both in case to help prevent instrument from tarnishing while stored.
Great product, keeps my silverplated Yamaha Bobby Shew Flugelhorn and goldplated Bach Strad, in great shape, no tarnish, as well as, keeps the horns from tearing apart the lining of my Gard gig bag! A winner! I purchase from Dillons over a year ago, still works and looks like new! Will be buying more!