Brass
![Brass die, along with zinc and copper samples.](/Images/godic/202501/01/Brass3218.jpg")
,_c._1500,_The_Cloisters3218.jpg")
![Microstructure of rolled and annealed brass (400X magnification)](/Images/godic/202501/01/Microstructure_of_rolled_and_annealed_brass;_magnification_400X3218.jpg")
![Brass sampling cock with stainless steel handle](/Images/godic/202501/01/00_BMA_Automation_Sampling_cock3218.JPG")
Brass is a metal alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.