1. 4 color filters to allow you to have different background colors. They are used to either correct the light balance or create dramatic lighting effects. These are also used to change colors of backgrounds. They are designed to be used with the barn door attachment / lens holder. 2. Honeycomb designed to give you ultimate control on the direction of your light. The honeycomb grid turn a strobe head into a specular light source. It emit a beam of light precisely where you aim. Photographers who use these tend to use many, "painting a scene" precisely with pools of light. 3. This 4 leaf barndoor set is specifically designed for use on the reflector. Barndoors is essential accessories for any lighting system. These devices alter the shape, intensity, or color of the light output from your flash heads. Use of a barndoor set result in a shaft of light, when it is attached to the front of the reflector of your light source. The size of the shaft of light be determined by the opening of the leaves, and the distance of the light from the subject. 4. Standard Reflector Dish 176*125mm for Bowens Type Studio Light Strobe. Specifications: Product model:BD-04 Quadrilateral Beehive Light-Blocking Pane Material:Metal material Hive diameter:18cm Film size:17.8x17.8cm Folding dimensions:19x 19cm Applicable:Suitable for the standard mask with a size of 18cm Color: As shown Package Contents: Standard lens*1 Color filters*4 Four-leaf honeycomb grid*1 Diffuser*1 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.