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Hollow Stoppers, High Quality Borosilicate Glass (BORO 3.3), Heavy Quality

Price range: $2.10 through $12.50
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Penny Head Ground Glass Stopper, High Quality Borosilicate Glass, Heavy Quality

Price range: $2.00 through $13.50
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Rubber Cork Stopper, Lab-Grade, High Quality & Reusable

Price range: $0.35 through $17.20