18 Inch Doll Clip-In Hair Extensions. Imagine your favorite doll creating a variety of hair styles with this set of 3 hair extensions. Each set comes with 3 different color extensions: 1 Purple, 1 Hot Pink & 1 Blue. The extensions are secured to a “comb-clip” that snaps easily into your doll’ hair, and are 10″ long. Your American dolls can do their “do’s” in so many ways.