Standard cable ties are typically used to quickly bundle wire and cable but can be used for a variety of purposes. Also known as zip ties, standard cable ties are typically made of nylon and are more flexible than metal ties and narrower than hook-and-loop cable ties to fit in smaller spaces. They have a tail that wraps around material and locks by inserting it into a pawl in the tie's head. As the free end of the tail is pulled, the cable tie tightens and won't come undone. Some cable ties are used in everyday applications, while others have more specialized uses.