Features: superior low retention (filter and non-filter) option has smooth, hydrophobic surfaces to ensure accurate pipetting filter option reduces cross contamination and prevents damaging aerosols from penetrating into the pipette extended length tips (10l and 1000l) allow better access to the bottom of test tubes, reagent bottles, flasks and other vessels pipette tips are universal fit and compatible with major pipettes molded volume reference markingso 10l: marked at 2l and 10lo 10l extended length: marked at 2l, 5l and 10lo 200l: marked at 20l, 50l, 100l and 200lo 300l: marked at 10l, 50l, 100l, 200l and 300lo 1000l: marked at 100l, 500l and 1000lo 1000l extended length: marked at 150l, 300l, 500l and 1000l