1.four size:55mm,60mm,65mm,70mm 2.material:CR39 lens 3.round top,flat top are available Bifocal lensSemi-Finished lensTechnical data:1.Material:CR-392.Abble Value:583.Transmission:Over the 98%4.Special Gravity:1.325.Abrasion Resistance:6/8H6.Treatment -General UV protection -option HEMW(ITO)Coated specifications of 1.499 Semi-Finished lens single-vision65mm/70mm,50base-1000baseSpecifications of 1 ...