Sterile & Non-Cytotoxic -Sterilized by gamma irradiation. Films are also free of cytotoxins. Prevent Contamination -Films eliminate well-to-well contamination, microbial and viral contamination, evaporation (excluding breathable membranes) and sample spillage. Ideally Sized and Designed -6 x 3.25 rectangles fit all microplates. Two scored end-tabs make film positioning and removal hassle-free. Thermal Stability -Designed to withstand a wide temperature range. Easy Specimen Retrieval -Pierceable sealing films facilitate easy removal of samples with a pipet tip.