These are Premium Lincoln Viking Welding Helmet 2x4C Series Lenses.
These lenses have Viking's 4C™ Lense Technology which provides Superior Outdoor Performance to Reduce Eye Strain. The lense dimensions are 4.25" wide x 2.0" high x 0.20" to 0.32" thickness (depending on model).
There are 4 models to choose from: Variable Shade 8-13, Auto Darkening Shades 9, 10, and 11. Battery included. Prices vary depending on the model.
Call with any questions at 602-850-7399.