This pendant along with my Upsidedown Ninja is one of a few designed to look like they're actually climbing or hanging from whatever cord you use like a rope. You can even double them up and have a few different ninjas hanging around your neck, or skip the neck part entirely. I've had people put them on a bracelet or just hanging from a string for decoration somewhere. The ninja is about 4cm long.
I recommend it in either black dyed plastic or matte black steel on a cord or ball chain, but you could get it in any color and it fits most standard strings and cords.