GLX Helmets Digital Auto-Darkening Solar Welding Helmet with Automatic Shade Adjustment (Matte Black, One Size) Precision of digital control with memory Viewing window: 3.7/8 inch x 1-5/8 inch Cartridge size: 4-3/8 inch x 3-1/2 inch x 3/8 inch Arc sensor: 2+2 Total weight is 1.3 pounds