Fit Pipetman, Ultra EZpette, XL3000i and other leading pipettors. SHARP Classic precision barrier tips eliminate false signals caused by aerosols. SHARP Classic tips feature low retention polymer technology that virtually eliminates sample retention. Inert hydrophobic barrier. These tips provide the most accurate sample delivery in the industry. They contain no nucleic acids, PCR inhibitors, detectable nucleases or endotoxins. All sizes are natural color, presterilized and free of metallic content.