Manufactured from 100% pure porous polyethylene, filters are designed to prevent liquids and aerosols from entering the body of the micropipette to protect against cross-contamination. Best suited for biological applications, these tips are non-cytotoxic, non-hemolytic, and have a 99.9% bacterial filtration efficiency (BFE). Tips are manufactured from ultrapure USP Class VI certified, virgin polypropylene. DNase, RNase and Pyrogen free.