All our candles are made of real, natural beeswax. Not a synthetic beeswax. Approx dimension are 18cm hight x 1.8cm wide. But they will fit each candleholder. Just "stick" candle to your candleholder by dripping a few drops of melted beeswax on your candleholder or simply sharpen the base of candle to fit the candleholder's eye. Burn time: approx 4-5hrs Why beeswax candles? - They are safe for human and environment. Beeswax is naturally occurring product made by bees. Paraffine (used in majority of non-beeswax candles) is made of petrol! Soy wax goes through chemical process of extraction from soy oil, its bleached, hydrogenated and perfumed.