Nite Ize is known for crafting high quality, innovative key accessories. Now with the IdentiKey Card Storage + ID System, it's time to get rid of the mystery around that jar or drawer full of keys. This key organizing cartridge allows you to label, store, and organize up to four keys in a compact, flat cartridge, easy for storing just about anywhere. The included durable, colorful write-on tags make key identification simple. Simply write on the IdentiKey Tag with permanent ink, affix it to your key, and slide it safely into one of the integrated key slots in the card. The card can be hung or snapped together with another IdentiKey card to store up to eight keys together in the space-saving system.