Measuring approximately 4′ in length and made of lightweight ripstop nylon, the 2-way Fabric Barndoors and Grid for PavoTube 30C from Nanlite attach to the LED tube and allow you to narrow and shape the wide 180-degree beam spread of the tube to as narrow as 5 degrees to light specific areas of the subject. Alternately, you can use the included fabric grid to narrow the beam spread to 45 degrees, while the barndoors eliminate spill light.