A characteristic of Tanba-fu is that along with the ordinary weft threads of cotton, they also weave in slub silk (tsumami ito). At one time Tanba was a silk-production area, and after most of the silk thread had been reeled off the cocoons, the remainder cocoons were hand spun into slub threads. Since the short fibers are joined with the fingers, slight lumps result. These add the luster of silk to the beautiful horizontal stripes in Tamba-fu.