The best quality bristles come from a strip running across the backs of wild hogs in Chungking Province, China. Bristle hairs are stiff and coarse with natural curve and have a V-shaped split end called a "flagged tip". Brushes formed with the flags turning into (or interlocked with) the ferrule offer the most spring, shape retention and control. Bristle brushes are best suited for oils and acrylics.
A bristle is a stiff hair or feather. Also used are synthetic materials such as nylon or straw in items such as brooms and sweepers. Bristles are often used to make brushes for cleaning uses, as they are strongly abrasive; common examples include the toothbrush and toilet brush.