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Castaldo See-Thru Mold Frame - 3/4" Thick (2" x 3"), Castaldo See-Thru Mold Frame - 3/4" Thick (2" x 3"), Designed for used with liquid mold material. Cold mold no vulcanizing. Plexiglass material and built-in sprue former. Frames are held together with large rubber bands.
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