I purchased these wires for an industrial electrical project and was beyond impressed with their quality... My analysis of this product showed that they were sturdy well-insulated, and had a reliable connection. The wires have lasted WITHOUT any degradation in performance or safety issues over time, making them a great investment for any industrial and scientific applications. The only potential drawback is their relatively high cost compared to other wiring options, but for the quality and longevity, it's definitely worth it..