The OXO Good Grips Wire Cheese Slicer has a unique tensioning wheel that allows you to tighten loose wires. After repetitive use however, even the OXO wire may break over time. Simply remove the broken wire from the product and insert and tighten a Replacement Wire into place. The Wire Cheese Slicer Replacement Wires are sold as a set of three in a plastic case that makes them easy to find and easy to store in your kitchen drawer.