1)made by Korea machines with competitive price and good quality ,have one year quality guarantee 2)Coating color:green and blue (won't move out in two years) 3)power range : SPH:0_+12.00 CYL:0_4.00 4)Diameter :plus(+) 65mm and minus(-) 72mm 5)super hard coating protection are available also semi-finished lens 1)1.56 single vision lens 70mm 2)1.56 single vision Aspheric 70mm