16 speakON connectors for audio equipment, black and green design. Used. Used for less than a year. They worked fine when connected and in use. Thank you. Loudspeaker cable connector speakON FXX series, 4-pole (compatible cable diameter 6-12mm) Rated current: Max. 37A rms Neutrik's unique bushing and strain relief accommodate cables with diameters from 6mm to 12mm. IEC 61984 certified (can be used as a component for equipment compliant with product safety standard IEC 62368-1) High reliability and robustness manufactured with world-renowned Neutrik quality Easy assembly as the strain relief is fixed to the insert simply by tightening the bushing Easy and reliable twist-lock system Ergonomic design with non-slip material on part of the housing The bushing's free-spinning design prevents kinking