The Mason Pearson Popular Boar Bristle/Nylon Mixture Hair Brush (BN1) is the largest size brush with 8 rings of boar bristle & nylon tufts. The brush is 9 inches long (head length is 5 inches) and 3 1/4 inches wide. The size is the largest of the Mixture brushes. The boar bristle/nylon is recommended for normal to thick hair while the popular size makes it ideal for hair of very long length.