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A Roman candle is a long cardboard tube. A fuse is placed at the top of the tube. Inside, the tube is filled with alternating layers of slow-burning pyrotechnic composition, stars, and gunpowder. The candle burns from top to bottom and sequentially shoots burning stars upwards. The number of stars in a Roman candle can range from 4 to several dozen. There are candles with simple effects, such as alternating colorful balls, as well as more complex ones, such as small fireworks, shimmering clouds, and "snakes." The most popular candles shoot a small number of stars but produce extraordinarily interesting light and sound effects.