1) Nd: 1.56 2) Abbe value: 42 3) Specific Gravity: 1.28 4) Density: 1.14g/cm3 5) Available color: brown, grey, bule, green, purple, pink, orange 6) Diameter: 65mm, 70mm 7) Power range: SPH: 0.00 ~ +8.00 / CYL: -0.25 ~ -2.00 SPH: 0.00 ~ -8.00 / CYL: -0.25 ~ -2.00 8) Features: a) Color changing with in few seconds between outdoor and indoor b) Color darkening concentration reach 70% for PhotoGrey and PhotoBrown and 55% for pink blue, green, purple and orange c) High original transmission, high rate of darkening in the sun, High rate of fading out of the sun d) 100% intercept to uv400nm ray 9) Semi-finished lenses Base: 2.00, 4.00, 6.00, 8.00 Skype: clearoptical