Each year, the names of the winning team members are engraved onto the NHL's Stanley Cup. Over time, the Cup's base grew in size and shape to accommodate more names. Eventually, it was determined that the Cup could not keep on growing, so it was decided to remove and retire some of the older engraved metal sections.
The bottom half of the modern Stanley Cup features five bands, with each designed to contain the names of 13 champion teams. Every thirteen years, the top (oldest) band is retired and a new blank band is added to the bottom. The next band will be retired in 2017.