Film, self sealing, laboratory, thermoplastic, 4 inches x 125 feet (WxL), 100mm x 37.5m (WxL), highly elastic, designed for airtight and moisture-proof sealing, forms a completely tight seal even with irregular shapes and areas, interleaved with paper to prevent sticking, supplied as single roll mounted in cardboard dispenser box, colorless, semi transparent, pack of 1, Bemis, Parafilm M, PM-996.