Bronze alloys have the unusual and desirable property of expanding slightly just before they set, thus filling the finest details of the mold. Then as the bronze cools, it shrinks a little making it easier to separate from the mold. Forms: 20 Lb. Ingot, 5 Lb. ingot, Shot ( Polished or Unpolished ), 1/2” Polished Cubes, 2” Cut Bars