Sterile aspirating pipettes are completely transparent and designed for the transfer and mixing of liquids. They are also used in a wide variety of applications such as vacuum or pipettor aspirating procedures. Polystyrene (PS) Non-plugged Sterilized by gamma irradiation Sterility assurance level (SAL): 10-6 Non-pyrogenic Individually wrapped in thermoformed paper/plastic peel packaging Safe alternative to glass pipettes Material: Polystyrene (PS). Transparent, no graduation marks Non-plugged Sterilized by gamma irradiation. Sterility assurance level (SAL): 10-6. Non-pyrogenic. Individually wrapped in thermoformed paper/plastic peel packaging. Safe alternative to glass pipettes.