glass lens 1.56 photogrey lens 1.index :1.56 2.material:glass 3.dia:72mm/65mm 4.HC HMC HMC+EMI 1) imported material from Italy. Longer time won't be yellow.2) More easy for tinted the color fur optical.3) Diameters: 50mm,55mm, 60mm, 65mm, 70mm,75mm4) Uncoated lens, hard coated and Multi-coating,HCT,Super hard5) progressive,flat top/round top bifocal, Tinted lens, polarize lens(gray and brown)6) ...