Ambion Barrier tips prevent cross-contamination of samples by means of an aerosol filter. They are RNase- and DNase-free and are ideal for handling RNA, PCR applications, and for working with radioisotopes or toxic chemicals. Ten racks containing 96 tips each are provided. They are compatible with Eppendorf, Finnpipette, Oxford Benchmate, Pipetman and other brands of pipettors. Each lot of tips is subjected to rigorous testing for RNase contamination and is certified to be nuclease-free.