The thickness of the 1894 ice hockey puck is about 25.4 mm.

The ice ball has a diameter of 7.62 cm, a thickness of 2.54 cm, and a weight of 156-170 grams. It is made of hardened rubber. Monograms, trademarks and advertising printed on the puck may not exceed 4.5 cm (1 3/4") in diameter on each side of the puck, or no more than 35% of the area on each side of the puck. They may be printed on both sides of the puck at the same time .

The origin of modern ice hockey:

Modern ice hockey originated in Canada. According to records, as early as 1855, whenever winter came, some sports hobbies in Kingston, Canada Players often gathered on the frozen lake, holding hockey sticks in their hands and skates tied to their feet, chasing each other and hitting balls made of wood chips and other objects.

There was no unified standard for early ice hockey games in Canada. There is no strict organization in terms of rules and competition. There is no limit to the number of people participating in the competition, with a maximum of 30 people per team. The referees can be selected by the players and replaced at will.