WGGE Open screw type Banana Plug accept bare wire or spades , accept 18 to 12 AWG speaker wires Color coded black/red rings for maintaining proper polarity/ First way installation 14 & 16 gauge speaker wire has to fold the wire over, then tighten the banana plug,it will not affect the sound quality. Secure, positive contact with binding posts Material: copper Size: 4mm length: 45mm Surface: 24K gold plated No soldering required, HIGH QUALITY W&G Global Electronics Inc. mainly produce Test lead with Alligator Clips, HDMI Cables, Banana Plugs, Wire Strippers and so on. We only provided high quality and good price products to each customer. Quick Detail: Open screw type Material: copper Size: 4mm length: 45mm 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 No soldering required