Yamaha GP Mouthpiece Trumpet 14A4a

I already play on a Yamaha 14A4A silver plate mouthpiece on my Yamaha 8310z gen 3 trumpet. This is a treat for me, because the Gp version is beautifully designed and complements the gold lacquered trumpet. I'm delighted to own it. The playing characteristics are identical to the SP as one would expect, however I like the way the extra weight balances wth the trumpet and the gold finish feels warmer and offers a tad more grip than the sp. Also I practise switching from Bb to piccolo Bb all the time, so I now don't have to bother removing and inserting one mouthpiece. Overall I'm delighted with this addition.