This is a pack of four Deans Female Ultra Plug polarized connectors. These plugs are designed for maximum current draw applications and provide an excellent connection for high performance battery pack connections in cars and planes. These are used reguarly by racers for race battery pack connectors, charger connectors, receiver pack connectors and for starter box battery connectors.
When you have mastered how to solder these there is no other ones you want to use.
They withstand heat better than any other copies out there while soldering or under use in your RC vehicles. (I have tested copies also)
Nothing else than original Deans to recommend :)