5.56 /.223 Brass or Nickel (100-2500) ct.

5.56/.223 Polished Brass (100-2500) ct.
Nickel also available
 
This is mixed head stamp Brass.
Washed and polished. 
 
Delivery is through the USPS's Priority Mail standard air service. Packages usually arrive to their domestic destination within 1-3 business days.