FlexFit® Flexible Proximal End FlexFit provides a secure seal with lower insertion force than competitors. StarStop® Positive Stop No matter how tips are applied, xTIP4™ pipette tips will always eject at the same light force. The StarStop® feature works with LTS-style pipettes to create a strong seal in the same location, every time. X-Resin® Low Retention X-Resin is our proprietary resin that is proven to reduce sample retention resulting in improved accuracy. Blade® Optimal Surface Area Blade technology lowers the chance of hanging droplet formation by optimizing surface area at the distal end of the tip saving you time with each draw while improving precision