1) cr39 plano polarized lenses: \na) round(complete film), square(half film)\nb) diameter: 70mm/75mm \nc) center thickness: 2.0mm - 2.2mm or according to the requirements\nd) base curve: 600, 800\n2) cr39 polarized single vision finished lenses: \na) diameter: 65mm/70mm/75mm\nb) power range: \nsph: 0.00~ -6.00/cyl: 0.00~ -2.00\nsph: 0.00~ +6.00/cyl: 0.00~ -2.00\n3) cr39 polarized single vision semi-finished lenses\na) diameter: 70mm/75mm\nb) edge thickness: 12mm or according to the requirements\nc) base curve: 200, 400, 600\nskype: clearoptical