The brass content of zinc also determines the properties of the metal. For zinc content up to 35% by weight approximately, the phase generated is α-Cu, i.e. a solid solution of Zn in Cu. For a content of 32-39% wt. Zn, phase a coexists with phase b, while for a content greater than 39 wt%. Zn also creates the phase γ, which is fragile.