Advanced Catalyst Systems Platinum Bright Embers REAL PLATINUM CATALYST - Platinum Bright Embers are catalytic embers for your vented gas fireplace or log set BRIGHTER - In addition to creating a bright flickering appearance like that of real wood ember beds, these embers radiate broadband infrared heat thus creating a warmer fire and reducing the formation of soot on gas logs *USE WITH ROCK WOOL - When placed on top of existing mineral wool ember beds, the catalytic embers combust unburned fuel from the burner to provide a dynamically more realistic looking ember 5 GRAM BAG - Contains one single bag of five (5) grams of Platinum Bright Embers. This is enough material to dress up log sets up to 42 inches when used with mineral wool. VENTED FIREPLACES ONLY - For compatibility with your unvented or vent-free gas fire, please consult with the OEM to ensure that your appliance has been tested for compliance