Oval Metal eyewear, constructed of optical steel base metal with bronze electro-plate and adjustable non-slip silicon nose pads, fits well for those with smaller facial features. Included fitted side shields increase scatter radiation protection. Available with Rx* lenses. Model 52 - Front Lenses: 0.75mm Pb Equivalency Optical Lead Glass - Includes Side Shields: 0.50mm Pb Equivalency Lead Foil - Optional Rx*: Single Vision (SV), Bifocal (BI) and Trifocal (TRI)