Caputo 00 flour is ideal for pizza dough for two reasons: one, it's finely ground, and two, it has a lower gluten content than most flours. The "00" refers to the texture of the flour: Italian flours are classified by numbers according to how finely they are ground, from the roughest ground "tipo"1, to 0, and the finest 00. Gluten, the natural protein that remains when starch is removed from wheat grains, creates the elasticity you feel when you bite into a crunchy loaf of bread. The lower the protein content of the flour, the lower the gluten, and the lower the gluten, the less elasticity there will be in your dough (cake flour has the lowest gluten level). Gluten levels are controlled by selecting different strands of wheat for processing: high-gluten bread flour is made from wheat that has 14-15% gluten. Meanwhile, the Caputo 00 is made from a selection of the finest grains the Caputo family can find to give your dough just enough, but not too much, stretch at 12.5% gluten.