1) Premium quality 2) Imported raw material.(PPG) 3) Diameters:55mm,60mm,65mm,70mm 4) UC,HC,HMC coating Guarantee:1) 1 year quality guarantee.2) Muli-coating ( AR) machines are from Korea.3) Imported material from Italy. Longer time won't be yellow.4) Meet CE and FDA standard. Other Detaileds:1)Semi-finished lenses are also available.2) Progressive, flat top/round top/invisible bifocal lens, ...