... Value:35 5.Specific Gravity:1.28 About Us Danyang Haha Optical Glasses Co., Ltd is ... and services: - Optical Lens in all index 1.499, 1.56, 1.60, 1.61, 1.67, 1.74, 1.523, 1.70 - Full ... Transition and Polarized) - Available in all kinds of Optical Rx coating, colour tinting service With advanced production ... Jiangsu, China Main featuresCR-39 RX optical lens1.Index:1.56,1.492.Dia:65/70/72mm3.Monomer:PPG4 ...