The Impact Fabric Grid for Large Square Luxbanx is a 40 x 40" light modifier that attaches quickly to the softbox's recessed front via touch-fasteners. The 40° grid narrows the beam spread from your softbox to control spill light and add directionality similar to a reflector while maintaining a soft quality of light. Unlike unwieldy rigid grids, Impact fabric grids are extremely lightweight and fold flat for transport in the included carry case.