This 250mL Erlenmeyer Flask is made from borosilicate glass and has a beaded rim. It is a FISHERbrand product from Fisher, a trusted brand in lab equipment. The flask is graduated and has a conical shape. It is perfect for use in labs for mixing, heating, and storing liquids. This flask is made in the United States and is ideal for those in the medical, lab, and dental fields or for businesses in need of quality glassware.