The kit includes two male and two female connectors of all six types. Any adapter can be created on the spot, in just seconds. Simply screw any combination of the 24 connectors to one of the six Universal Interfaces. No soldering or crimping is needed so connectors can be used over again in a variety of combinations. All contacts are gold-plated. Connector bodies are silver plated, machined brass with teflon insulation. The zippered, soft leather case protects and organizes the collection.