I don’t remember what these are called. They work well for me. They are made so a screw goes through both ends of the thing, but I just put the screw through one end. That leaves the hanger open so you can easily remove or add a wire to the hanger. A closed circle makes it difficult to make changes like that. These are flexible. They come in various sizes, so you can use a larger one if you need to hang several wires. They are available in stores like Lowes.
