1: Big volumes :Diameter 2.5-2.8 cm (suitable for loose big wave) * 2: Middle volumes Diameter 2.0-2.2 cm (moderate) * 3: Small volumes : Diameter 1.8 cm (suitable for intensive small wave) * Quantity(Curly Hair):18PC, Quantity( Tool):2PC. * Important Note: Please double check your measurement before purchase.