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This extra large flat watch case back seal assortment is a gasket kit for watchmakers and others who work on watch case backs. These round gaskets are made of solid flat soft rubber to create an airtight seal that prevents water from entering the watch case. They are flexible enough to fit into the grooves of the case back and stay in place while pressing or screwing down the case back. As this assortment includes gaskets of various extra large sizes, you should definitely be able to find a correct match for the gasket you need to replace on the larger style watches made today.