1) Material: CR39 , AC, PC 2) Diameter: 70/28, 65/28mm 3) Power: Add+1.00 to +4.00 4) Finished and semi-finished available. 1) Material: CR39 , AC, PC2) Diameter: 70/28, 65/28mm3) Power: Add+1.00 to +4.004) Finished and semi-finished available5) Coating: UC, HC, HMC Round top lens