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 8 x 12 tips each are provided. They are compatible with Pipetman™ pipettors. Each lot of tips is subjected to rigorous testing for RNase contamination and is certified to be nuclease-free.