The crystal structures of different forms of brasses are by far the most important distinction. Three different types of brasses are as follows: Here's a see on the trigger plates and something to note could be the pronounced dress in on two of the 3, although the 3rd one https://defaultdirectory.com/listings13123378/5-simple-techniques-for-staccato-2011-gun-safety-seminars-for-youth-organizations-and-families