The Porcupine family of styling brushes feature a unique combination of boar and nylon bristles. The white nylon bristles are extended for deep penetrability into any hair texture. They are especially useful for penetrating damp hair. The black boar bristles can then hold the hair for super styling results, as well as assist in the distribution of natural oils. Five sizes of rounders are available including the aerated G-36J, a 4-1/2" diameter jumbo rounder! #G-36 2" diameter rounder for medium to long hair, reinforced boar with nylon porcupine bristle.