This is the Repair Kit for Traveler's notebook.  But it is also for customization.  Look at all those colors of bands!  Heart eyes. It makes sense that Traveler's Notebooks are designed to be used for years to come and after you use it so much, you may need to repair or replace bands.  So if you need please buy one of these.  BTW we truly believe Traveler's Notebooks just get better with age.