The Viking 3350 Born to Weld Welding Helmet from Lincoln Electric offers 4C lens technology that is designed to eliminate blur, distortion and eye strain by reducing color saturation in the LCD while also providing a consistent shade at any angle. The 12.5 sq. in. auto-darkening viewing area is large enough for a range of industries that use multiple welding processes. 4C stands for the following attributes: clarity (optical clarity), color (real color view), carat (lightweight auto-darkening filter and cut (even shade from any angle).