Custom trading pins are a treasured promotional item. In fact, some custom trading pins are so coveted by their collectors that they are willing to pay high amounts for them. Pin trading has become a traditional hobby among collectors. The majority of trading pins circulate among sports events, popular brands, and iconic events. Pin trading has become such a popular event that some places even hold special events for it. No one knows for certain when and where pin trading originated, though some believe it may have got its beginnings with the sport of curling since some of the oldest trading pins around appear to have come from curling clubs. These curling club pins date back as far as the middle of the nineteenth century.