For blow-drying longer-hair Best for The large barrel of the size 4 (55mm) brush is best for blow-drying longer hair. This ceramic -barrelled brush retains its heat to allow for a faster blow-dry. Hollow 55mm diameter barrel Vented ceramic barrel retains the heat of the hair dryer for faster styling. Professional design Hand finished, professional design. Soft touch handle Non-slip handle with soft touch for styling control.