Okay, first I have not played in a long time and getting back at it again so forgive my ignorance. I currently own a Silver Flair (1974). Will eventually look to get a different horn - though I do still love this one and am not interested in selling (tks for the inquiry in the intro section). While searching to purchase a trumpet for a nephew to help him out, I am seeing something about Monel valves. What are they? Are there any advantages? Can I purchase them and replace the valves in my trumpet with them?