Jewelers use Mold for Hollow Sprue. Create your own sprues and achieve a larger surface area to place more rings on the tree and using less wax, investment, and gold in the process. Jewelers use fully refined to eliminate impurities, Ferris Wax Sprue Rods burn-out quickly without expansion or residue. Perfect for building even the most demanding sprue systems. Three time-tested hardness grades are available, as are special diameters or lengths. Sprue Wax is specifically formulated and designed to be used as sprues. Comes in red color and 6” long rods.
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