The Kanstul COL 103 Coliseum Marching Bb Trumpet was designed especially for the marching field. It features a .470" large bore and a 5.1" bell which will allow the sound to carry over the band to the press box.Since 1982, Kanstul Musical Instruments has been dedicated to the production of professional quality instruments. The modern 32,000 square foot manufacturing complex and the sales - showroom are located in Southern California, one mile east of Disneyland. Kanstul's skilled craftsmen combine the best of Old World Craftsmanship with the latest in computer-assisted design to provide the world's finest musical instruments.