3.75" x 4.80" Black ABS bi amp terminal cup with gasket. HIgh quality terminal cup features dual inputs with shorting straps. Allows you to put speaker in bi amp mode or single input. 100% brass binding posts with high purity satin nickel finish allow for maximum signal transfer. Accepts up to 6 Awg or dual banana jacks and can handle up to 20 amps. Back of terminal cup has rigid rails for accepting 67mm wide pc boards. TC60-BP50SN is the cup preferred by most professionals.