Proprietary manufacturing technology enables creation of a more hydrophobic tip that allows users to pipet viscous samples, load dyes, surfactants and solvents with greater accuracy. Less sample is retained within the tip which decreases the amount of reagent loss while significantly increasing the levels of reproducibility from experiment to experiment. 1233H98 through 1233J03 fits Beckman Biomek FX/NX, Multimek AP96, and Biomek 3000. 1233J04 through 1233J09 fits Beckman Biomek 2000 and Biomek 1000.