BorosilÂ® brand Pipettes are made of specially-selected, heavy wall, machine-drawn, borosilicate accurate, bore glass tubing. They have precision formed jets, and bevel ground ends that resist chipping. The graduations are made in durable white enamel that is resistant to laboratory reagents and repeat washing. All Pipettes are individually measured and then marked. The uniformity of bore ensures accuracy between any two readings and they are autoclavable. The Class B Volumetric Transfer Pipettes are generally used for accurate measurement and decanting of liquids. Comes calibrated for delivery and complies with ASTM E-969-02.