This 500 ft. 16/4 (16 gauge, 4 conductor) oxygen-free copper speaker wire is designed for high-performance audio installations in residential and professional environments. The high-purity OFC conductors provide excellent signal transmission with reduced distortion, delivering crisp and clear sound for home theater systems, studio setups, and other audio applications.The cable features a durable CMR riser-rated flame-retardant jacket that meets safety standards for in-wall installations. The sunlight-resistant outer jacket also allows the cable to be used in both indoor and outdoor environments while maintaining long-lasting performance.With 99.999% oxygen-free copper conductors, the cable improves conductivity, minimizes signal loss and phase distortion, and provides stable audio performance across a wide frequency range. This ensures that music with complex tones and instruments such as cymbals and pianos sounds more detailed and natural.Designed for professional installers, the cable includes ascending and descending E-Z footage markings so installers can easily measure cable length during installation without additional tools. Clear legend markings for channels, rooms, and zones help simplify wiring and speed up large audio projects.The cable is also RoHS compliant, meaning it is manufactured without hazardous substances, providing a safer and more environmentally responsible solution for audio wiring.