The Helmet Diamond Glass 4D is a tempered glass screen protector designed specifically for the OnePlus 7T to shield its display from daily wear. It features a 9H hardness rating, which makes the surface highly resistant to scratches and shocks that typically occur during accidental drops. To ensure a seamless fit, the glass uses 4D precision molding that follows the curved edges of the phone's screen. This design, combined with its black finish, allows the protector to blend in naturally while keeping dust away from the display area.