"Below is a list of three layer Membrane Electrode Assemblies(MEA)that are offered as standard products at electrodesandmore.com. The proton exchange membrane is Nafion coated with anode and cathode layers. Variations are available to anode and cathode catalysts, loading, membrane and size. If you need some specific MEAs feel free to provide us your requirement by clicking ""Custom Product"" on the top. We will contact you with the details."