GR Piccolo Trumpet Mouthpieces are standard with a Cornet Shank. The GR Piccolo Trumpet Adapters allow you to use these mouthpieces with horns which require trumpet shanks.
#41 - Tighter and allows for great control. Articulation up high is excellent for playing the Brandenburg.
#43 - Middle of the road. Medium blow resistance. Plays big and full. Assists with a clear sparkling tone.
#45 - The largest and good on A side. It has a bigger sound on the Bb side. Preferred by strong players. Produces a huge piccolo sound. A favorite for using the piccolo in a large orchestra.