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S5-3A-top S5-3A-bottom S5-3A-side	S5-3A $55.00 S5-3A - Optic Mold for Glassblowing Quantity: S5-3A - Optic Mold for Glassblowing. The S5-3A has triangular opening. 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.