Keep your 5mm LEDs in place with these chromed metal LED holders. These are handy for projects using individual LEDs as they look sleek, and your LED won't budge. Slot the LED through the opening, cork it with the plastic end, and screw on the washer for a secure grip.
Adafruit NeoPixel Digital RGB LED strips come to us in 4 or 5 meter reels with a 2 or 3-pin JST SM connector on each end and separated power/ground wires as shown in the pic below. If you order a full 4 or 5 meters, you get the full reel with both connectors installed (like the pic below).
If you buy less than a full reel, you'll get a single strip, but it will be a cut piece from a reel which may or may not have a connector on it. If the piece comes from the end of the reel, the connector may be on the output end of the strip!