Giddings & Webster Lead Z Trumpet Mouthpiece

I purchased this online but it doesn't suit me, so I'm selling it.
It's a stainless steel mouthpiece and comes with its original pouch.
It's like new, only tested a few times.
The following is copied from the online store:

Jazz Lead Z
Cup Inner Diameter: 15.875mm
Throat Width: #27 (.144 inches)
Cup Depth: Shallow

~A completely new mouthpiece made with stainless steel~
Giddings & Webster Mouthpieces is a manufacturer specializing in brass mouthpieces, with their workshop located near Seattle, a city on the West Coast of the United States. They conceived the entirely new idea of using stainless steel as the material for their mouthpieces and, through continued research in conversation with famous players, have created a finished product. This is a completely new mouthpiece that has captivated renowned brass players such as Alan Baer, Sonny Ausman, Don Harwood, and John Sass...

●Uses new material. Comfortable feel and expanded volume range.
All Giddings & Webster mouthpieces use stainless steel. Compared to brass mouthpieces, they offer a significantly more comfortable feel and create an environment that is easier to play for extended periods. Furthermore, the increased material strength gives the mouthpiece itself great power, expanding its dynamic range.

●Sharp cut. The secret lies in the shank tip.
The shank tip of Giddings & Webster mouthpieces features a very sharp cut. This serves two purposes: first, to smoothly transmit lip vibrations, and second, to accurately feed back the instrument's response to the player. Giddings & Webster mouthpieces play the role of always connecting the instrument and player in the best possible state.

Jazz Lead Z
Cup Inner Diameter: 15.875mm
Throat Width: #27 (.144 inches)
Cup Depth: Shallow