The Engineer® is constructed from a nickel-silver alloy and is available in two sizes(54mm or 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. Meets ANSI Z87.1-2003, CSA Z94.3, CE (EN166) and AS/NZS1337 safety standards.