Felji 8" Heat Sealing Machine Impulse Manual Bag Sealer All Metal, Ready to use instantly - No warm up needed Adjustable timer allows perfect seals for a wide variety of bags thicknesses. Can be used with Mylar bags up to 6 mils thick. Seal Length: 8 inches Can be used to seal KEL-F, MYLAR, POLYFLEX, P.V.A., POLYETHYLENE, POLYURETHANE, POLYVINYLCHLORIDE.