This is the set in solid silver for tenor or bass trombone. The set comes complete with the securing bands. Rather than go through the entire explanation of what these do I encourage your to go to the website, Facebook page, or the numerous Youtube videos and check them out. They work on a premise that not all agree with. Do they make a difference in your sound. Yes, but will it be enough of a difference to justify their cost or a difference you like I cannot say. I personally liked what they did for my sound which I thought it made it clearer, but that sound (at least on my equipment) was not a good fit for British style bass band. Unfortunately it will scratch you horn at the mounting points. This set was $500.00 + new. Please feel free to as any question or request more pictures.

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