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Petardo, caracterizado porque comprende un tubo que contiene la mezcla explosiva detonante, que por uno de sus extremos está cerrado por una pared constituida por una mezcla inflamable prensada que actúa de conductor del fuego hasta la mezcla explosiva, cuya pared en su cara interior presenta un entrante central, preferentemente cónico, para favorecer la propagación del fuego y aumenta la potencia da la detonación y que por el extremo opuesto el tubo está cerrado por un tapón.