The large one can generally burn for about 10 hours, the medium one can burn for about 7 hours, and the small one can burn for about 5 hours. The large one is close to the real size. The medium one is similar to an ordinary orange, and the small one is slightly larger than a ping pong ball. Avoid sunlight exposure and long-term heating at a high temperature greater than 180 ° C. It should be placed in a cool and dry place. The main ingredient of this product is paraffin wax, which has a low melting point and is less dense than water and insoluble in water. It melts into a liquid state by heat, and is slightly heated, volatile, and smells paraffin wax. It solidifies when cold, which is convenient to use.