Sealing films prevent evaporation and protect samples during processing, storage, and shipment. They have superior quality film and uniform adhesive. With 2 perforated end tabs for accurate positioning. Removable end-tab backing for sealing around ends of plate. Films are packaged in zipper bags. Manufactured from 2mil polyester. 83x143mm, -20C to 80C, tissue culture, Co2 exchange-Yes, Pierceable-Yes, DN/RNase free-No