rainin pipette tips fit most pipette brands, including a pipette tip for rainin, gilson, eppendorf, sartorius (biohit), thermo (finn), and vwr pipettes. made from 100% virgin polypropylene in a fully automated, class 100,000 clean room facility, rainin tips provide excellent clarity and flexibility for accurate touch-off. To assure absolute purity, no additives or dyes are used, and we follow iso 9001-compliant manufacturing procedures to eliminate all external sources of contamination.