One tip, any pipette! Manufactured in a sterile, clean-room environment using the purest raw materials and state-of-the-art manufacturing techniques, you can be assured that lot-to-lot you will receive a high quality product offering consistent performance. Sterilized PIPETMAN EXPERT™ Tips are free of Human DNA, RNase, DNase, PCR Inhibitors and pyrogens. EXPERT Filter Tips feature a patented, low-retention polymer that creates a hydrophobic surface to minimize sample binding when dispensing. This inert polymer will not leach into or degrade your samples so there's no concern for contamination.