ZAPTM SLIK Low Retention Aerosol Filter Pipet Tip, Extra Length provided by STEMart fits most popular 10 µL pipettors. Ultra low fluid retention. 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.