This is the WS Deans 3-Pin Connector Set. FEATURES: Low resistance with gold plated contacts Compact size and light weight Polarized so as not to be installed backwards Great for battery and servo connectors INCLUDES: One Male plug (Black retangular shaped) One Female plug (Black retangular shaped) Six Heat shrink tubing (about 3/8") REQUIRES: Soldering COMMENTS: The instructions are on the plastic packaging This connector is used on some of the older Ace and World engines radio systems.