Durable white ceramic enamel marking spot on each tube Combining top-notch and uncompromising quality with an affordable price, the Kimble/Kontes KIMAX Test Tubes, Reusable, Borosilicate Glass, with Glass Stopper, Kimble Chase 45100 13100/ 89001-510 can fulfill your laboratory needs while still offering a great value for the money 7mL Glass-Stoppered test tube made from KG-33 glass tubing with a top finish to receive a ground glass joint glass stopper, and with uniform wall thickness for maximum service. KIMBLE® Graduated Reusable Centrifuge Tube, case/12 KG-33 Glass Tubing Lot 16 Kimax Kimble 37033 Serologic Pipet Borosilicate Glass 1mL - 1/100mL TD 7mL Glass Stoppered Tubes 7ml capacity to neck with uniform wall thickness for maximum service KIMBLE Concentrator Tube, 25 mL Capacity to Neck: 7mL., 13 x 100 (Approx., O., D., x Approx., Length)., Stopper Size: 9., Kimble #: 45100-13100., A test tube or culture tube is a common piece of laboratory glassware consisting of a finger-like length of glass open at the top and usually with a rounded U-shaped bottom Designed from ASTM Specification E982, Type III requirements.