These IsoTips feature an inert, hydrophobic barrier which prevents aerosolized contaminants from coming in contact with pipettor shafts,. They are manufactured using Statistical Process Control (SPC) in their modeling operation to ensure premium quality. This process yields consistent critical dimensions such as tip straightness, length, and sealing ring location. Tips will properly attach to and eject from your pipettor everytime you use them. Ideal for preventing cross contamination is critical, such as DNA amplification and radioisotope handling.