cr-39 lens 1.Index 1.499, Dia 55/60/65/70mm, HMC 2.FDA, CE, Drop-ball test 3.very cometetive price, profession quality cr39 lens, optical lens, resin lens with Index 1.499,1. FDA, CE and Drop-ball test.2. Dia 55mm, 60mm, 65mm, 70mm3. UC / HMC / Super Hydrophobic Coating4. All quality is 100% ensured good forever!