Designed for use with our Jumbo Cold Protection Tree Wraps, our 20-Inch Plastic Coated Wire Twist Ties are made from centered steel wire encased in plastic to prevent rusting. They're Ideal for long term tying, taking twice as long to biodegrade as paper ties. They also have the flexibility to be loosened as plants grow. Sold in bundles of 500 or cases of 10,000.