Silk production was considered the most valuable of the region during the 20th century. The vilayet had schools devoted to silk production. The region had obtained silkworm seed from France. Bursa was the heart of silk production. The silk was mainly exported, sometimes as thread or cocoons. In the mid 19th-century, a disease spread through the silkworm, causing a decline in production. As of 1920, the disease was eradicated and business was steady. Cotton production remained steady, and towels and robes were common items produced from cotton. Velvet and felt were also produced. Felt was used for saddles and other equestrian related goods. The area also made tanned leather and carpet. The city of Kütahya created tiling and pottery. Soap and flour was also produced in the vilayet.