Alexander 102s are compensating double horns, which means they are capable of playing the same notes as a regular double horn while being a lighter weight. It is made of unlacquered red brass and has all original Alexander parts. This includes the detachable bell and Alexander (Lawson bells are compatible, too) bell ring set. The compression sits above 4.0, and the valves use mechanical linkage. Comes with an Alexander detachable bell horn case.