Using these control grids is a breeze. Just place them over your 2-foot or 4-foot LED tubes. They'll fit SGC Lights or other comparable ones thanks to their universal size. When you're done, simply put them back in the travel drawstring pouch for easy storage. To keep them in good shape, clean them with a soft, dry cloth. Avoid using harsh chemicals as they might damage the grids. Also, store them in a cool, dry place away from direct sunlight.