The D'Addario ECG26 XL Chromes are the company's heaviest gauge flatwound electric guitar strings, providing a warm and mellow sound and remarkably smooth feel that's perfect for jazz guitar. These medium gauge (.013 - .056) produce a significant amount of bass, and D'Addario's hex-core design with flattened stainless steel ribbon winding make for an ultra-durable string that sounds great.