A 1.5mil thin, soft non-permeable aluminum foil film with strong medical-grade adhesive, AlumasSeal II films eliminate the need for heat-sealing devices or mats during thermal cycling. Each film measures 82.6 x 142.9 mm and offers sufficient sealing area for all PCR plates. Length between the perforations with end tabs removed is 125.4 mm. Compared to other aluminum foils, AlumaSeal II has less tendency to roll back or itself when removing the backing paper and conforms well to the plate during application. The sealer is easily pierceable with single or multichannel pipettors making experiments work cleaner. AlumaSeal PCR sealers are packaged in packs of 100 sheets.