Add a block-out panel to your SEGO Modular Lightbox—a solid, non-printed SEG (silicone-edge graphic) fabric panel used on the back of a single-sided backlit display to block light from passing through, keeping your front graphic's illumination clean and even. It fits into your SEGO frame's profile the same way a printed graphic does. Every panel is finished to the exact dimensions of your SEGO frame, so it fits like the original.