This is the Dorr CFK-30 Colour Foil Kit for Cameras Flashes [372198] Dorr CFK-30 Universal Flash Colour Foil Kit includes 30 various colour foils for individual or combined use for a variety of colour effects. The additional foil comes with 2 coatings; one side is silver and serves as a reflector and the rear side is black and functions as a barn door. The foil holder is supplied with a velcro strip for flexible attachment to most popular flashes then the foil can be easily slid in the side. ...Contact us if you need more help.