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In the Casentino area, wool processing has very ancient origins. Ever since the Middle Ages, rough and poor wool is at the origin of the well-known Panno Casentino, a rough and wear-resistant fabric. Originally it was worn by monks and mountaineers, today it is widespread throughout Italy. Wool represented a precious resource, so much so that in 1861 the most important company in the Casentino was the company of the Stia wool mill, owned by the Ricci family. The development of wool mills was due not only to the presence of sheep but also to the abundance of waterways that facilitated the processing of the fabric. At the wool factory in Stia, today there is an exhibition where various documents are collected (samples, production documents, accounting instruments), objects of particular symbolic value, and period pieces in Casentino fabric.