Hollowick 37 Hour Liquid Wax Disposable Clear Plastic Fuel Cell (36/case) Burn time 37 hours, square bottom. For commercial use only. sold by the case. Clean candlelight without candle mess. The best liquid wax lamp fuel available. Burns cleaner than solid wax candles. Non-staining, and no melted wax mess. Leaves no black soot on your lamps. Using Hollowick disposable fuel cells is the most convenient way to operate your lamps and is preferred by most users today. Save labor by simply replacing the empty fuel cells with new ones. No other maintenance or adjustments necessary. Nonhazardous, no shipping restrictions, no storage limitations or insurance issues.