This simple, yet charming, Natural Stone Oil Lamp brings a tranquil touch to your spaces, indoors or out. Each stone holds approximately 12 ounces of oil, giving it a burn time of up to 12 hours. Light the 9” long cotton wick and enjoy the ambiance. The oil reservoir inside the lamp is treated with varnish to prevent oil from seeping through the porous stone. A lovely Zen-inspired alternative to traditional candles.