Quality glass made by Schott, green weld 3.0. These are unused blanks designed to be ground & polished into eyeglasses for welders anywhere from + or 6 diopters. 55mm diameter by 4mm thick. Meniscus shape. Great for experimenting with your grind and polish expertise, or if you are in the ophthalmology business, you need these and weve got a good supply.
