One of our first is still one of our most popular. The EngineerĀ® is constructed from a nickel-silver alloy and is available in two fashionable styles: Aviator (54mm or 58mm lenses) and Conventional (58mm lenses). Spatula temples are constructed of a brass alloy for easy adjustment. The nose pad is also adjustable and constructed from soft, pliable PVC. Sideshields are permanently attached. The Lady Engineer features the same construction as the Engineer, but in a 55mm round lens to conform to smaller faces. Replacement lenses are available.