Dagan DG-GLL-BLACK 1/2 - 3/4-Inch Fire Glass, 10, Black offers a contemporary fire media option to accent your gas fire pit or fireplace. The glass pieces are approximately 1/2" - 3/4" in size, are tempered for long-term heat consumption, and come in (10) pound increments. 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".