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510 total views The tempered glass fences were broken by high-speed ice hockey during a game in the German ice hockey league in April 2018, and the game had to be suspended until the glass was replaced. Unfortunately, the tempered glass was broken again on November 4th in another game. The ice hockey is made of black hard rubber with a thickness of 2.54 cm, a diameter of 7.62 cm, and a weight ranging from 156 to 170 grams. The ice hockey puck can reach a top speed of 150 kilometers…
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