Why have the visiting captain call heads or tails when they can call stick or whistle? Flip the weighty 1.3oz gold-toned UmpireHockey.com "Challenge Coin" at the start of every game during your umpiring career to demonstrate your commitment to excellence, education, integrity, and fitness. The coin is 1.75 inches/44.45mm in diameter. Perfect for indoor and outdoor games. Price includes First-Class Mail® shipping to addresses in the continental USA.