The Bello 4pcs Measuring Cylinder Set is made of premium Borosilicate 3.3 glass, known for its excellent heat and chemical resistance. Each 250ml round base cylinder provides clear graduation markings for precise volume measurement, making it ideal for school, college, and professional laboratory use. These cylinders are perfect for measuring and transferring liquids accurately in chemistry, biology, or industrial labs. Their strong, stable round base prevents tipping and the narrow cylindrical shape allows for easy and accurate readings.