In the manufacture of so-called woollen and worsted goods, various materials are used as substitutes for wool proper. The employment of such fibres has tended to cheapen, to a very considerable extent, the productions of the loom, and made it feasible to weave an attractive article at a surprisingly low price. The trade generally has also been largely extended by the entrance of re-manufactured fibres into textile productions. The following are the most important and valuable wool substitutes now in use: noils, mungo, shoddy, extract, and flocks.