Material: Butyl RubberColor:BlueSize: 13mm/1/4 inchQuantity: 100Weight: 2g eachApplication: 1.These stoppers can be used to make self-healing injection ports in Mason jar lids or medicine bottles. 2.Use with hypodermic needles to inject cultures, therefore eliminating the need to remove the lids on your culture jars. 3.They fit 7 mm diameter opening.
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