What are challenge coins used for?

Traditional challenge coins are presented to recognize an individual`s special achievement or simply to stand for membership and unity in an organization, company, or community. Throughout history, receiving a challenge coin has been considered a great honor. High-quality challenge coins may even be treasured and passed on as an heirloom.
Historically, challenge coins were used in the military to demonstrate proof of membership and affiliation with a specific unit. They`re a big part of military culture.

Custom Coin as a good and great gift for coins lovers,usually they are be put on a gift box,pocket or hang on a wall for showing!