Collapsible aluminum frames of the Sunbounce System come in different sizes & can be assembled easily with the Sunbounce grip head. These extension frames can be combined with reflecting, light-reducing, & light-absorbing screens (optional) in order to produce soft, hard, natural, & artificial lights This 20" extension enables mounting a Sunbounce frame (sold separately) to a standard light stand This flexible Sunbounce grip head accessory can be extended up to 20 inches