Great for passing beefy signals, or for just connecting LED strips together!
This pair of 3-pin JST SM pigtail connectors mate perfectly with the addressable RGB Stringxels. They also make a good general purpose connector for any project. Each pack comes with one male and one female connector. Each connector features 20cm (8") wire leads and are terminated with a JST SM connector on one end and left bare on the other.
The Stringxels have 4 wires, but only 3 are wired to a connector containing the ground, clock, and data lines. 5V usually doesn't carry far, so running separate 5V leads to the other segments is expected.