Original: According to the rules proposed by the Associazione Vera Pizza Napoletana, the genuine Neapolitan pizza dough consists of wheat flour (type 0 or 00, or a mixture of both), natural Neapolitan yeast or brewer's yeast, salt and water.
Simplified: The genuine Neapolitan pizza dough consists of Italian flour, natural Neapolitan yeast or brewer's yeast, salt and water.