“I tried both GR yellow, nickel sliver, and MK42 sterling sliver leadpipe. They are awesome! I play Rath R4F trombone, the GR yellow gives me a clear, fast response and open sound, I would like to use it with solo pieces. Nickel sliver presents a even and stable tone with exposing the sound, especial the low range, open and warm! MK sterling sliver is a amazing piece, it helps you to make very warm sound when you’re playing some soft phrase, also easy to make a very brilliant sound with giving lots of air. I would use during some big pieces. Great job!”