A baguette is a long, thin loaf of French bread that is commonly made from basic lean dough (the dough, though not the shape, is defined by French law). It is distinguishable by its length and crisp crust. A baguette has a diameter of about 5 or 6 centimetres (2 or 2⅓ in) and a usual length of about 65 centimetres (26 in), although a baguette can be up to a metre (39 in) long. The "baguette de tradition française" is made from wheat flour, water, yeast, and common salt. It may contain up to 2% broad bean flour, up to 0.5% soya flour, and up to 0.3% wheat malt flour. While a regular baguette is made with a direct addition of baker's yeast, it is not unusual for artisan-style loaves to be made with a pre-ferment ("poolish") to increase flavor complexity and other characteristics, as well as the addition of whole-wheat flour, or other grains such as rye. Baguettes are closely connected to France, though they are made around the world. In France, not all long loaves are baguettes; for example, a short, almost rugby ball shaped loaf is a bâtard (literally, bastard), or a "torpedo loaf" in English; its origin is variously explained, but undocumented. Another tubular shaped loaf is known as a flûte, also known in the United States as a parisienne. Flûtes closely resemble baguettes and weigh more or less than these, depending on the region. A thinner loaf is called a ficelle (string). A short baguette is sometimes known as a baton (stick), or even referred to using the English translation French stick. None of these are officially defined, either legally or, for instance, in major dictionaries, any more than the baguette. French breads are also made in forms such as a miche, which is a large pan loaf, and a boule, literally ball in French, a large round loaf. Sandwich-sized loaves are sometimes known as demi-baguettes or tiers.