A Few Words about Paintbrush Bristles
Paintbrushes have three main parts: the brush handle, the ferrule, and the bristles or filaments. The handle has a metal band attached to it; this is the ferrule. The ferrule is crimped and glued to the handle and the bristles or filaments to keep them bonded. The brush head is the tuft of natural bristles or synthetic filaments that holds the paint and is the most essential part of any paintbrush.