The product is a lot of four B-Line BLWG-1H protective lenses with a 50mm shade of 5. These lenses are designed to provide protection for welders while working with welding equipment. They are specifically made for use in CNC, metalworking, and manufacturing settings, offering a high level of protection against radiation and sparks. Ideal for industrial settings, these protective lenses are essential for ensuring the safety and well-being of welders and other workers in the manufacturing process.