banana plug YH3335 Screw type Material: copper Size: 4mm length: 43mm Surface: 24K gold plated Color: red/black plastic ring Can accept bare wire or spades Can accept 18 to 12 AWG speaker wires Color coded black/red rings for maintaining proper polarity Secure, positive contact with binding posts Copper body construction and ferromanganese tips Some type of connector front and back No soldering required