The fuels offered are created specifically for bio-ethanol ventless fireplaces. It is a fuel specially formulated to provide the cleanest & safest fire possible. SMARTFUEL features an exclusive patent-pending Safety Pour technology. First in the industry to provide the safest possible flash-free transfer of fuel from the bottle into the fireplace reservoir. NEVER SUBSTITUTE ANY OTHER FUEL IN PLACE OF LIQUID FUEL FOR VENTLESS FIREPLACES. Length: 1 quart bottles x 12 per carton.