1 GW Helios Trumpet Mouthpiece Rim Diameter 17.29mm, .681 inches

Based on a Bach 1 inner rim diameter.  Stainless steel is a more efficient material getting your buzz into the instrument with more energy and power. For advanced players who have a strong embouchure and support.  Available in Deep, Medium Deep and medium cups.  We recommend the medium cup as our most versatile cup for the majority of your playing needs.  The deep and medium deep cups are best for large ensembles where core and breadth of tone are required.