Hublonium is a unique metal alloy developed by HUBLOT combining, among others, magnesium and aluminum. The aluminum – magnesium alloys provide excellent combinations of strength and corrosion resistance by solid-solution strengthening and work hardening. Several alloying elements and production conditions are necessary to produce a “good” aluminum-magnesium alloy. Hublonium is remarkably light and shows very good mechanical properties. It is perfectly suited for watches, since it significantly reduces its weight.