Metal encased in red plastic is our most popular twist tie spool used on the Tie-Matic HD58 machine. The spool is designed with a metal core encased in plastic to stay tied when wet and to resist rust. Unlike using paper twist ties, that fall apart and run the risk of not staying tied. The flexible core and plastic sheath wrap around an object to be bundled. From the Food Industry to the Industrial Marketplace, our spools provide the perfect closure for plastic ice bag closure. 2000 feet of twist ties and you are assured of optimal performance from your automated twist tie machine.