Genuine Italian Voxbell brand "snail" horns. This is a set including one high tone horn and one low tone horn which used together create a loud blaring sound that commands your attention. If you know how Italians use their horns, you'll appreciate these. Relay included.
Voxbell horns were original to LeMans 1000 all years LeMans IV and LeMans V, SP III, some T5, Quota 1000, but fittable to most all Guzzis and other brand bikes.