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18-8A-top 18-8A-bottom 18-8A-side	18-8A $413.00 18-8A - Optic Mold for Glassblowing Quantity: 18-8A - Optic Mold for Glassblowing. The 18-8A has 8 pointed ribs. It is 18" tall with a 8-1/2" opening at the top that tapers to a 3-1/4" opening at the bottom. This mold is open at the bottom. It is made of cast aluminum.