We are offering these Brand New GLS Audio Generation 4 Safe-Connect!â„¢ Series Gold Banana Plugs at an awesome savings. They feature the Sure-Gripâ„¢ technology which allows for an incredible wire connection. They have 9 High Tension Blades with Flex-Compressionâ„¢ technology for maximum conductivity. The back shell case has a rubber grip which minimizes shorting if 2 plugs touch together. These GLS Audio Safe-Connect!â„¢ Series Banana Plugs work best with 10 gauge, 12 gauge, 14 gauge, 16 gauge, and 18 gauge wire. These plugs are made of high quality 24k Gold Plated H59-1 Brass. The hole diameter in the back is 6.5mm. No soldering and no crimping required!