https://www.thecanadianencyclopedia.ca/en/article/quebec-bridge-disaster-feature
The iron rings are made under licence for the Corporation by a Canadian company. Contrary to a common misunderstanding, the iron rings are not made from the failed Quebec Bridge that spans the St. Lawrence River.
現在的戒指也改良成不鏽鋼的了，不再是最初的鐵質戒指
