The Eisco Graduated Beaker is made of clear borosilicate glass and has a spout on one end around the rim for easy pouring. The glass is thick and durable. Along the sides there are graduated markings divided in increments of 10ml so you can measure liquids accurately. This 50ml beaker is suitable for use in a classroom lab setting or in a professional science lab. Eisco carries a selection of additional chemistry products including graduated measuring cylinders test tubes test tube racks genetic taste testing paper strips molecular model parts and more (each sold separately).