4.00 x 4.75 inch Black ABS bi amp terminal cup. 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 24k gold plating for excellent signal transfer. Accepts up to 6 Awg or dual banana jacks and can handle up to 20 amps. Back of terminal cup has 2 sets of rigid rails for accepting 67mm wide pc boards and 4 legs for alternative mounting.