Screw connector fitting, no soldering needed Standard size fits speakers For maintaining proper polarity,, contact with binding posts,Corrosion resistant, 24K gold plated finish,Copper body construction and ferromanganese tips Perfect for connecting the satellite and speakers to AV receivers Banana plugs make speaker installation a breeze. They are designed for use with amplifiers or speakers use binding posts. Not only is it easier to make the connection on the back of your amp, it is , with no of stray wire strands creating a short contacts. The plug body is made of copper fitted with a ferromanganese tip. The entire plug is then plated with gold to help prevent corrosion and connections. Color: black, red Material: copper Size: 20*2mm Package Contents: 20x 2mm Banana plug(10Black+10Red) Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.