The general materials of banana plugs: Body:Brass Spring: Steel, Beryllium copper Surface: Nickel plated, Gold plated Insulator: PVC, ABS, PA, PE
Banana PlugsApplicable
A number of widely used plugs are based on combining 2 or more banana plugs with a plastic handle and other features for ease of use and to prevent accidental insertion in other such plugs. Many of these plugs are derived from the double banana plug consisting simply of two banana plugs spaced 3/4 inch (about 19mm) apart.
US style double banana (pictured): A plastic housing containing two banana plugs, allowing simultaneous connection of a signal line and a ground (earth) line; see the photo. The housing may allow the connection of individual wires, a permanently attached coaxial cable providing both signal and ground, or a coaxial connector such as the BNC connector
