ZAPTM Aerosol Filter Pipet Tip, FlexTopTM and Extended Length provided by STEMart fits most popular 300 µL pipettors. Sterile. Low mounting and ejection forces less than 3 kg. The pipet tip features patented robotically inserted endotoxin free filter and refillable autoclavable rack. The pipet tip is made of polypropylene USP Class VI resin and free of protease, human DNA, ATP, RNase/DNase and endotoxin. Validated Sterilization (ISO 11137) for use in Research and Medical labs. This product has been independently audited for the Accountability, Consistency, and Transparency (ACT) Environmental Impact Factor label for laboratory products.