The Flex-o-lock is a 5" flexible key ring with a patented ball-knob closure, making it easy to open and close. Perfect as a binder ring to hold documents. To Open: Form a heart shape, push forward, up and out. To close: Form into a heart shape, place knob in socket, and slide into place. Supplied in assorted colors: Clear, Black, Blue, Magenta, Red, and Teal. Flex-o-Loc length is measured with the Flex-o-Loc cable open and laying in flat line.