Here for sale is a custom 66.5 MX/MS GR Trumpet mouthpiece. This is a very unique mouthpiece, and I think GR may only have made one of these! This is designed for someone who plays 1.25C mouthpieces, but wants something to give a bit of zip, and help in the upper range. Rim size is close to 1.5C-2C, and has a shallow-ish cup (around warburton M/SV size?). It however has a lower “alpha angle”, which will mean the chops can vibrate more freely. Any questions please ask - I’m only selling as I have downsized to a 66 rim-size so don’t need it any more! Thanks!