These 1 Liter PYREX® wide mouth Erlenmeyer flasks are especially recommended for use as titration flasks and are designed with heavy duty rims to reduce chipping. For convenience - these flasks are graduated in durable white enamel to show the approximate capacity and have an extra large marking spot. They require a No. 11 rubber stopper for sealing. Their uniform wall thickness provides the proper balance between mechanical strength and thermal shock resistance. Material: borosilicate glass code 7740. Capacity: 1000mL. Flask style: Erlenmeyer. Neck style: wide mouth. Top style: heavy duty rim. Stopper style: no stopper. Rubber stopper number: 11. Graduation range: 250-1000mL. Graduation interval: 50mL. Baffles: no. Features: reusable. Sterile: no. Height: 292mm. Outer diameter: 168mm. 6/Pack; 4 Packs/Case. Corning® #: 5100-1L.