Head Jog 87 Brush has ceramic and Ionic technology. Ionic bristle radial brushes with Ceramic coated barrel. Vent holes allow warm air to circulate at the roots of the hair to allow fast, effective blow-drying and styling. Head Jog 87(25mm), Head Jog 88 (33mm), Head Jog 89 (43mm), Head Jog 90 (50mm), Head Jog 91 (60mm) and Head Jog 92 (Paddle).