Stamp color will vary.

Thrower Rocs are different from the Collector Series Rocs. Each year, a small number of Rocs do not get used for Collector Series releases. Generally, this is due to minor cosmetic imperfections that do not affect the disc's performance or because there was simply extra discs leftover after all collector series Rocs were produced and sold. These discs vary in age and appearance, adding to their mystique, collectability, and appeal. They are referred to simply as “Throwers”.