Z SERIES basins are crafted from non-ferrous metals. These metals are combined with high tech polymer binders creating a material that is beautiful, durable and easy to maintain - an exclusive material offered by Bates and Bates. Unlike plated basins, these are solid basins that will easily take the wear and tear most sinks receive. Z SERIES basins are non-porous, inhibiting bacteria and mildew growth. Combine that with this unique new material that is throughout the entire sink, not just a finish that will wear away and you've got a basin that looks great and is easy to clean.