"Duration: +/- 17.5 hours Spark plug ""RAL Quality Mark"" is an official European quality standard that guarantees the raw materials used in the spark plugs and the combustion properties. Products bearing this certification guarantee the health and safety of our consumers Easy to use; trim the wick to a height of 1 cm. Retains colour and shape throughout the burning time. The candle produces little smoke when it burns and has minimal drops Made in Europe"