We are a chinese manufacturer of optical lens, our products include: cr39 1.49/1.56 hmc/1.61 hmc/1.523 mineral lens/1.70 hi-index lens/round top bifocal lens/flat top bifocal lens/progressive lens etc. U/c(uncoated) hc(hard coated) hmc(hard multi coated) is available. Diamenter: 56mm 60mm 65mm 70mm