The Z Series Brush Collection features cork handles, extra long concave barrels that conform to the shape of the head and cut blow-drying time in half, and natural boar bristles mixed with a unique carbon fiber heat resistant nylon. • Z5 80mm – Largest in the collection. Easily creates soft shiny irregular curls or smooth straight looks. • Z4 65mm – This extra long brush is the most challenging brush in the collection and requires years of experience, for experts only! Offers amazing tension for smooth shiny looks. • Made in Spain.