Our Kirby Allison Wellington Pig Bristle Shoe Polishing Brush is crafted out of 100% ultra-long pig bristle, which is stiffer than horsehair, and pinned at an exceptionally high-density (especially for pig bristle). Pig bristle does a better job buffing polish off more textured leathers. Our Wellington Pig Bristle brush requires raw bristle from domesticated pigs that is 3.0 inches long, before pinning, which is incredibly rare and difficult to source. Due to limited supply, we cannot guarantee a consistent availability of this brush.