13x100mm Glass Test Tube, With 13mm Rubber Stopper, Black (Pack 10) Karter Scientific 401Y2 These reusable glass round bottom Test Tubes are made of 3.3 borosilicate glass to reduce pH changes and contaminants potentially leached from soda-lime glass. Rubber Stoppers are made out of excellent grade rubber featuring low sulfur content. Do not use stoppers with food or drink.
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