Midwest Hearth Vermiculite Granules for Gas Logs - 12 oz Bag HIGH QUALITY - Midwest Hearth vermiculite uses high-quality exfoliated vermiculite INCREASED PERFORMANCE - Vermiculite helps in spreading gas throughout the entire burner pan of propane gas logs ADDS REALISM - Adds realism to your gas fireplace | Sparkles and shines in the fire! SAFE TO USE - 100% carbon monoxide and oxygen depletion safe and 100% asbestos free LARGE 12oz BAG - Large 9" x 12" bag - 12 oz of vermiculite