Boar & Tourmaline enhanced nylon bristle. Contoured bristle pattern “centers” hair for great styling and “gripping” results. Light weight foam gripped contoured core makes using the PROVO a dream. 4 diameters - 1 for any hair length. #1400 2" dia. for shorter hair sections #1405 2-1/2" dia. for mid-length hair sections #1410 3" dia. for longer hair sections #1411 3-1/2" dia. for longest hair sections #1416 Includes 3 ea. of 4 diameters Provo brushes feature HOUR GLASS SHAPED brush cores and bristle patterns for securely gathering hair for superior styling results. A quick TWIST OF THE WRIST for styling and holding. NO TWIST... JUST BRUSH for brushing out!