Show your appreciation for a work anniversary, job well done or other honor with these handsome challenge coins. This coin is crafted from zinc alloy -- giving the appearance and quality of brass coinage with a lighter weight. Choose from 1.5" x 3mm, 1.75" x 3mm, 2" x 3mm, 2.25" x 3mm, 2.5 " x 3mm, 2.75 " x 3mm, 3 " x 3mm sizes. dd your school, sports team, organizational or company logo, emblem or message to these coins to create a customized design and appearance that will last for years as a treasured memento.