Halcyon Aluminum BackplateAluminum Backplate As with most Halcyon products, an immense amount of behind the scenes work is required to create a plate that we are proud to sell. Halcyon backplates have been refined over the years, to provide the highest quality finish and materials available. Small details, like the unique bends near the bottom of the plate, create an ergonomic curve, increasing diver comfort. Meanwhile, our precise fabrication process ensures the quality you