The official size of a standard NHL puck is 3 inches in diameter and 1 inch in thickness. The puck is made of vulcanized rubber, which provides durability and a consistent playing experience on the ice. Its dimensions are crucial for gameplay, influencing how players handle it and how it moves across the rink. The uniformity in the size of pucks ensures that all games maintain the same standards, enhancing the challenge and excitement of ice hockey competitions.