This image is of a transformer that sits at the core of Princeton Power�s electrical power converters. The transformer "core" is comprised of thousands of nano-scale layers banded together into a solid structure. The bright red outer winding seen here is thousands of strands of braided copper cabling, coated in a non-conductive insulator and wrapped around the core. Princeton Power incorporates "nanocrystalline transformers" into power converters used in highly-efficient large-scale solar, wind turbine, and hydropower systems.