The B1 Traditional Custom Series trumpet was the preferred Bb trumpet of Renold O. Schilke, and the basis in design for all other B series instruments. Introduced in 1956, the B1 trumpet is among the most popular models, distinguished by its free and open feel from the reverse leadpipe and rounded full radius bend tuning slide. With the combination of a medium-large bore and a large throat bell, this design allows the player the diversity in sound color from a rich, full bodied dark sound to a brilliant ringing tone when desired, making the B1 a versatile, all-around instrument.

The B1 trumpet is available in four variations—a fixed yellow brass bell, a fixed beryllium copper bell, a tunable yellow brass bell, and a tunable beryllium copper bell—each designed to customize the instrument performance to the player.