It is probably something like this: https://smile.amazon.com/24-Long-Living-Bottom-Material/dp/B07RQW7F1B/ref=sr_1_6?crid=G0GPPZ43BXBY&keywords=Aquarium+canopy+hinge&qid=1646835562&sprefix=aquarium+canopy+hinge%2Caps%2C73&sr=8-6