These plastic volumetric pipets are manufactured from translucent polypropylene to Class B tolerances and are chemically resistant and resistant to breakage. Blue graduations, ring mark and inscriptions. Ideal for fluoro and silicate chemistry. Recommended cleaning with mild alkaline detergent up to 60ºC. Note: Exposure to temperatures above 60ºC may cause volume changes. These volumetric pipets are fully autoclavable for sterile liquid volume measurement. Reusable.