DESCRIPTION The FB-15011 frame is a rectangular hipster style safety frame made out of high quality TR-90 Nylon that has permanent side shields for added protection. This frame offers our standard high quality, distortion-free SF-6 Schott glass radiation-reducing lenses with .75mm lead equivalency and .50mm lateral production. The Model fits best for Medium to Large style heads. - FEATURES 0.75mm Lead Equivalency Schott SF6 Radiation Protective Lenses High quality TR-90 Nylon Frame - SPECS Frame Size: 55-17-140 / Weight: 88g