Globe Glass narrow and wide mouth Erlenmeyer flasks are designed with reinforced, beaded rims for strength and resistance to chipping.Flask, Erlenmeyer, Globe Glass, 2000mL, Narrow Mouth, Dual Graduations, ASTM E1404, 4/Box Meet ASTM E1404 SpecificationsHigh resistance to chemicalsUniform wall thicknessReinforced beaded rims to resist chipping*Dual metric scale graduations *Durable white enamel printingLarge white marking area Wide mouth conical flasks allow easy access to contents, while screw cap conical flasks include a GL45 cap with a PTFE liner for a leak resistant closure..