This Conair Quick Blow-Dry Pro Dual-Sided Barrel Brush features a unique half-vented round barrel. Air passes through the vented side of the barrel to heat the solid side â€" lets you smooth and finish or flip and wave hair! With the copper-coated metal barrel that provides up to 50% better heat transfer*, results are fast and fabulous! *Metal barrel provides up to 50% better heat transfer when compared to Conair plastic round brushes Conair Quick Blow-Dry Pro Vented Porcupine Half Round Brush Black Hair Brushes