The size of the ice hockey is 7.62 cm in diameter, 2.54 cm in thickness, and the ball weight is 156- 170 g, forming a flat cylinder. Ice hockey is also called "ice hockey". However, the ball of ice hockey is not a sphere, but a flat rubber disc, which looks like the China chess flag. This can also be seen from its English name "puck" instead of "ball".

In the official competition, the ice hockey should be "frozen" before use, which will reduce the elasticity of the ice hockey and increase the instability. In order to ensure the use of frozen ice hockey throughout the game, spare balls will be stored in ice bags and replaced at any time on the sidelines.

The rules of ice hockey.

In ice hockey, each team is allowed to register up to 20 players and 2 goalkeepers, with a total of 22 players. There are 3 regular games, each of which includes 20 minutes of net time and two 15 minute breaks. This 60-minute period is called "regular time". At a fixed time at the beginning of each game, the two sides of the game exchange venues. The final outcome will be decided by the number of goals scored by both sides.