A set of four popular low form glass beaker from Karter Scientific. 4-piece Beaker Set consists of one each of 10ml, 50ml, 100ml, and 250ml. Griffin Low Form Beakers are made of 3.3 borosilicate glass. Double Capacity Scale, Heavy-Duty, beaded rim and a spout designed to have excellent pouring characteristics., white marking spot, and uniform wall thickness throughout. 3.3 borosilicate is the highest level of inert glass available. Designed from ASTM Specification E960, Type I requirements. If you have any questions or concerns, please contact us. We are happy to make it right!