Looking for a metal-free packaging solution? Plas-Ties now carries a complete line of WIRELESS twist-tying material to secure your products. Flexible and durable poly core twist ties! Metal detectors and microwaves are no longer issues with our latest twist-tying material. Simply use a Poly Tie-Matic HD machine to produce a perfectly twist-tied product. Our ties are reusable, flexible and durable, even when microwaved.