The series was a joint collaboration by Hasbro, Marvel Productions and Sunbow Productions, the same team responsible for G.I. Joe and Transformers. The creator of the series, Christy Marx, had also been a staff writer for the aforementioned programs. The animation for most of the episodes was provided by the Japanese animation studio Toei Doga (now Toei Animation). -Wikipedia
The editions of all the dolls is 1000 except for Rio whose production size is 850.
Synergy This doll appears to use the Elise Jolie sculpt.
Each retails for $119. The girls are 12" and Rio is 12.5"
Promotional Poster - Hasbro
Four Dolls - Integrity Toys