PRODUCT NAME - Stackable Banana Connectors; Body Material: Brass; Spring Material: Beryllium Copper; Surface Material: Nickel Plated; Color: Black + Red HIGH QUALITY MATERIAL - Made of high quality material, the main body is brass, the spring is nickel plated on the surface of beryllium copper and the shell is plastic. 4MM MAXIMUM CABLE DIAMETER - The maximum cable diameter is 4mm in connection for soldering ELECTRICAL TEST - This 4mm stackable banana connector can be used for electrical testing Features: Made of high quality material, the main body is brass, the spring is nickel plated on the surface of beryllium copper and the shell is plastic. This 4mm banana connector can be used for electrical testing Connection for soldering, the maximum cable diameter of 4mm. Specifications: Color: Black + Red Body Material: Brass Spring Material: Beryllium Copper Surface Material: Nickel Plated Package includes: 5 × Black Banana Connectors 5 × Red Banana Connectors