Flex Spex Adjustable Reading Glasses are proudly crafted in the US, by the family-owned business located in Greybull, Wyoming. Originally designed for fly fishers, these reading glasses are highly versatile, benefiting many different professions such as farmers, truckers, surveyors, and more. The unique design features break-apart lenses connected to a gooseneck flex conduit - secured to a small bulldog clip with the company logo. The rubber-coated magnetic closure attaches to the temple piece or visor, and makes the lenses unobtrusive, accessible, and adjustable. The glasses are made of stainless steel, zinc coated music wire, copper wrapped stainless steel flexible conduit, and strong neodymium magnets. The CR39 plastic lenses come with scratch-resistant coating in powers of 2.00, 2.50, and 3.00.