The simple principle of expansion of the pellet snacks allows the utilization of a wide choice of starch based raw materials. Cereal flours are the most common ones, followed by root starches like potato and tapioca and cereal starches. A great advantage of the pellet snacks technology is the possibility of making formulas with peculiar characteristics like high fibre content, multi grain or multi coloured. Although the pellet production process generally includes a step to cook the starch matrix, allowing the use of raw flours and native (uncooked) starches which are cheap and widespread, some common raw materials are already cooked, such as the potato based raw materials like potato flakes and granules. Sometimes precooked or par-cooked cereal’ raw materials are also used. Pre-cooked materials generally do not require going through the cooking step but only the phases related to shaping and drying.