In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. Double Rotor Bass, .562" (14.27mm) primary bore, .580" (14.73mm) bore through rotor sections, "stacked" rotors function as a dependent system, 9-1/2" (241mm) annealed rose brass bell, three interchangeable leadpipes, chrome-plated inner slides, lacquer finish, 1-1/2G mouthpiece, deluxe woodshell case.