A paint brush usually consists of three parts: bristles, brush stem, and brush handle. The bristles are the core part of a paint brush, and their material and quality directly determine the lifespan and application effect of the brush. Common bristle materials include natural hair and synthetic fibers. Natural bristles are soft and have strong water absorption, making them suitable for delicate paintings and occasions that require high application quality; Synthetic fiber bristles, on the other hand, have the characteristics of wear resistance and durability, making them suitable for painting large areas and rough surfaces.