Med Lab Supply Science Glassware, Heavy Duty Borosilicate Glass Volumetric Flasks with Stopper/Snap Cap For over five years Med Lab Supply brand vials have become a trusted name in science glassware and compound pharmacy. Now we have expanded our glassware family to include Graduated Cylinders with Hex Base. Our Cylinders are made from the latest tubular glass form design manufacture processes. Using borosilicate 3.3 grade techniques, our flasks are lighter, but when compared to other form factor glassware - these flasks are sturdier, shatter resistant, heat resistant, and as chemical resistant as other heavier grade science glasswares. Our Graduated Cylinders meet or exceed the specifications of all major brands of science glassware media on the market to date. Alternatively, due to our efficiency in manufacturing and distribution, we are able to sell our own glassware at a much reduced cost versus other brands. Features: Snap top stopper included Flask capacity noted on Flask Material: Borosilicate Glass 3.3 Uniform wall thickness provides the proper balance between mechanical strength & thermal shock resistance. Borosilicate Glass Construction Graduations are in permanent white enamel. Please click to view our complete list of Laboratory Science Glassware Please click to view all glassware compatiable pens, crayons, high temperature & low temperature markers.