ZAP™ SLIK Low Retention Aerosol Filter Pipet Tip. Extended Length. Fits Most Popular 300 µL Pipettors. Sterile. Patented robotically inserted endotoxin free filter. Ultra low fluid retention. Protease, Human DNA, ATP, RNase/DNase and Endotoxin Free (non-pyrogenic). Polypropylene USP Class VI resin. Validated Sterilization (ISO 11137) for use in Research and Medical labs. Refillable autoclavable racks. 96 tips/rack. 6 racks/pack. 71.1 mm H. Made in USA.