GHD Classic Ceramic Iron MK 4.0 (1") - Salon-approved to straighten and smooth hair and create luscious curls, twirls or flicks, this original GHD ceramic styling iron features a unique built-in microprocessor which conducts heat fast and retains it more effectively. The result? Instant long-lasting heat for optimum styling control. Plus its advanced infra-red heat actually protects your hair by sealing in its natural oils, moisture and hair colour guaranteeing you beautifully straight hair with an attractive healthy shine. USA voltage. Plate is approximately 1 inch wide.