The D'Addario ECB81M is a light gauge flat wound string set for medium scale electric bass. XL Chromes are noted for their smooth feel and warm, mellow tone, essential to the sound and style of many jazz, blues, and rock players.D'Addario XL Chromes are the industry standard in flatwound guitar strings. They deliver a round, full low end without losing punch, making them ideal for jazz players of all types. Wound with flattened stainless steel ribbon wire, XL Chromes are then polished to unparalleled smoothness."D'Addario bass strings have the longest lasting punch, clear tone, and perfect tension of any brand I've ever played." - RUDY SARZOFlatwound Construction: Flat wound strings feature precisely flattened stainless steel wrap wire that is wound and polished to provide an ultra smooth feel and a full, mellow tone.Hex Core Construction: Precision drawn hexagonal core was pioneered by D'Addario. This innovation allows the wrap wire to grip the core for superior dimensional stability,