PYREX® 3mL Test Tubes are made from special tubing for optimum wall thickness. Well annealed, resistant to heat and chemically stable; beaded rims are fire-polished. Tubes have white marking spot. Material: Borosilicate Glass Code 7740. Style: Plain Cylindrical Test Tube (No Graduations, No Cap, No Stopper). Capacity: 3mL. Length: 75mm (Approx). Outer Diameter: 10mm (Approx). 72/Pack. 720/Case. Corning #: 9800-10.