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99.9% Copper Casting Grain - PER POUND
.999 Fine Silver Casting Grain - PER TROY OUNCE
Silicon Bronze Alloy Casting Grain (Yellow) - PER POUND
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This sprue mandrel is great for burning out a conical cavity on rubber molds. It eliminates the use of a sprue former in packing the mold. Ideal for jewelry makers and metalsmiths!
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