These Erlenmeyer flasks have durable BLUE colored ceramic enamel scales to indicate approximate volumes at various levels. KIMAX® narrow mouth 250mL Erlenmeyer flasks are your laboratory's best choice for economy and versatility and general laboratory usage. The tops are reinforced and tooled with a rounded finish, containing more glass to give them maximum mechanical strength. Body is thick walled with a long tapered outside contour to minimize chipping when struck or rubbed together. Designed to meet ASTM Specification E1404, Type I, Class 1 requirements. Enamel Scale Color: Blue. Kimble® #: 26500B-250.