Bought this a month after I picked up my new Strad and it has done a great job of keeping the tarnish off. I did find that if I left my hand guard on the horn the area under it became severely tarnished even in the bag. I believe that has more to do with the guard than the bag though and would recommend this to anyone looking to keep your horn tarnish free. In fact I am going to be buying one for my Flugelhorn as well because the bag is large enough to fit one.