Salco 20 ml Rimmed Borosilicate Glass Test Tube(200 cm 775 K Pack of 6)
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Base Tubes Without Marking with Cork Lid, Borosilicate Glass, Rimmed, Consistent Wall ThicknessHigh-quality borosilicate glass tubes, without printing, Rimmed and have excellent resistance to heat and chemicals, Blown, Accurate Size, and Consistent Wall Thickness.