The Zip Box Flag Set (Top and Sides) from Wooden Camera is designed to work with any WC Zip Box (4" x 4", 4" x 5.6", or 138mm round). This set consists of one "eyebrow"/top flap, plus two side flaps. Use the flags individually or together on the matte box to further shade your lens from flares or other unwanted light sources. These lightweight plastic flaps clip onto the matte box without tools.