We offer Schott SF-6 High Light Transmission lenses that offer over 92% visible light transmission with an abbey value of 40. The lenses offer a 0.75 lead equivalency and are 2.2mm thick. This material is the highest quality lead lens on the market today. It also has an extremely hard nature for being lead glass that gives it excellent scratch resistant properties. All lenses are heat treated and can pass the drop ball test for dress eyewear. Frame Architecture: New DuraLite? frame technology for comfort and durability Nosepiece: New SoftGrip? nosepiece for enhanced comfort and grip during lengthy procedures. Temples: New extended temple bars for more natural, contoured fit Side Shields: Completely integrated Optibloc? leaded side shields. The embedded shields provide lateral protection against scatter radiation, without adding weight or bulk Inserts: Soft, thermopolymer inserts on temples for a secure, comfortable grip. Warranty: All leaded eyewear comes with a one year warranty from the date of sale. Lenses: ProLiteHT lenses utilize exclusive SF6HT leaded glass for up to 20% more light transmission than any other brand. Lateral Protection: 0.50 mm ( /- .01) Pb extrusion. Weight: 1.69 oz (48 grams) Lead Equivalent Lens: 0.75 mm ( /- .05) Pb glass Frame Colors: silver or matte black finish Attenuation: 95% radiation reduction at 125 KVP Direct Beam Available in: non-prescription (plano), single vision prescription (rx), and bifocal prescription (bifocal).