Ever had a luggage zipper slowly open on its own? Or have you caught a thief trying to sneakily unzip your backpack? These 2 interlocking pieces add an extra layer of security to your zipped bags and luggage. Simply slide the 2 halves together and push the circle thru the hole until it clicks. Roughly the size of a quarter, the print should not take very long depending on your settings. You can print the 2 halves in different colors or keep them the same. Use small metal keyrings on each half to attach them to your zippers.