... 3.Small orders accept CR39 1.56 Photochromic Grey or Brown optical Lens /Medical lens Description:1. Material:Cr39 Abbe38Gravity1.28Abrasion6- ... kind patronage.We provide these optical lens as following:Optical Lens, CR39 1.56 Photochromic Gray/brown, CR39 1.56/1 ... .70 aspheric lens, 1.70 Titan lens, CR39 Lenticular lens, 1.61 High-index lens, 1.61 Hicyl lensSemi-finished photochromic lensSemi-finished ...