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S4-32A-top S4-32A-bottom S4-32A-side	S4-32A $55.00 S4-32A - Optic Mold for Glassblowing Quantity: S4-32A - Optic Mold for Glassblowing. The S4-32A has 32 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.