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S1-12A-top S1-12A-bottom S1-12A-side	S1-12A $55.00 S1-12A - Optic Mold for Glassblowing Quantity: S1-12A - Optic Mold for Glassblowing. The S1-12A has 12 scalloped ribs. It is 2-5/8" tall with a 2" opening at the top that tapers to a 1-1/2" opening at the bottom. This mold is open at the bottom. It is made of cast aluminum.