This SealerSales KF-300H White 12" Hand Impulse Sealer w/ 2mm Seal Width seals poly bags and other thermoplastic materials quickly and efficiently without any warm-up time. It can seal material up to 12" wide and 20mil total thickness. It is equipped with a plug-in electronic timer which controls the different sealing times needed for the varying thicknesses of different materials. Also available in 8", 16" and 20" with a 2mm, 2.6mm or 5mm seal width.