This 50mL PYREX® Folin-Wu digestion tube has a beaded rim and is fabricated from specially selected tubing for product durability. Engraved white-filled graduations at 25 and 50mL. Non-Sterile. Reusable. Material: Borosilicate Glass Code 7740. Capacity: 50mL. Tube Style: Folin-Wu Digestion. Tube Shape: Cylindrical. Bottom Style: Round. Top Style: Beaded Rim. Graduation Range: 25 to 50mL. Graduation Interval: 25mL. Tolerance: +/- 0.4mL. Cap Style: No Cap. Stopper Style: No Stopper. Outer Diameter: 25mm. Length: 200mm. Corning® #: 7900-25.