Dagan DG-TG-CRYSTAL 1/4-Inch Reflective Fire Glass, 10, Crystal offers a contemporary fire media option to accent your gas fire pit or fireplace. The glass pieces are approximately 1/4" in size, are tempered for long-term heat consumption, and come in (10) pound increments. Reflective fire glass adds an extra dimension of style with its shimmering appearance. Use our fire pit calculator to determine how many bags you will need to need to fill your fire pit. Usually, we recommend covering your burner until just covered, which can take anywhere from 1.5" to 4".