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What is the standard diameter of a regulation NHL hockey puck in inches?

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A regulation hockey puck is a vulcanized rubber disk that measures 3 inches in diameter, 1 inch thick, and weighs between 5.5 and 6 ounces. Pucks are frozen (Review) before NHL games to reduce bouncing and keep them sliding smoothly on the ice. The black rubber puck replaced wooden and even rubber ball predecessors in the late 1800s as the sport of ice hockey (Deals) evolved in Canada.