From Schilke:
 
The Schilke S32HD Custom Series Bb Trumpet offers the professional level player an instrument designed with more power and projection. The S32HD Series features a .460-inch bore combined with a medium-large taper heavy-gauge one-piece seamed yellow brass bell. This series also features a heavier mouthpiece receiver and leadpipe. The additional mass offers a very thick, powerful sound that is focused with wonderful projection. The Schilke S32-HD Custom Series Bb Trumpet includes a soft-sided double case and mouthpiece.