American Fire Glass AFF-COBLRF12-25-BUCKET 25 lb .5" Cobalt Reflective Fire Glass - Deep cobalt blue, with its intense electrifying hue, is not a color for the weak of heart. It communicates daring, strength and confidence. When your customers add our 1/2” cobalt reflective fire glass to their fireplace or fire pit, they will not only be setting up an exciting fire glass display worth remembering, but also making a bold statement about their personality.