Feature:1. Gold Plated Brass: Gold plated brass surface can effectively prevent corrosion, oxidation and insert copper gold plated material, increase the number of use.2. Product Purpose: Can be helpful to connect the ESC battery to an electronic device such as a remote control helicopter, able to provide a satisfying using experience.3. Useful Sleeve: The included elastic plastic sleeve is made of high grade material with good electrical insulation, durability, safety and long service life.4. Powerful Tool: Surface gold plating is corrosion resistant, not easy to oxidation, able to ensure stable transmission and high performance, suitable for daily use.5. Package Content: The package contains 2 male plug connectors, 2 female plug connectors and 2 sleeve covers, other accessories and tools need to be prepared by yourself.Specification:Item Type: 4mm Banana PlugMaterial: CopperColor: RedApplication: For Connection Of ESC, Battery And Remote Control Helicopter And Other Electronic EquipmentProduct Size: Connector Hole Internal Diameter: Approx.4mm or 0.16inWeight: Approx.10g or 0.4oz.Package List:2 x Male Plug2 x Female Plug2 x Sleeve CoverNote:1. Please allow 13mm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.