250 Gauge Anti Static Polythene Layflat Tubing Heat Seal Bags 150 Meter Rolls Made from extra thick 500 gauge (125 micron) polythene, 168m long rolls, suitable for heat sealing. Cannot be used for vacuum packing. Features an Anti-Static additive. These high quality Polythene Lay Flat Tubing rolls are designed to be used to package items via a Heat Sealer. Made from 500 Gauge Virgin Polythene, this tubing is very strong and durable. Please note dimensions refer to the product when flat. Packing the tubing will decrease the available width.