Optic Crystal is Among the Finest Crystal Available. Made From the Finest Quality of Raw Materials Available Resulting in Absolutely Clear Transparent Crystal. the Same Material is Used in Telescopes, Camera Lenses & Many Other Vision Instruments. Unlike Lead Crystal, Optic Crystal is Absolutely Lead Free, Perfect for All Kinds of Popular Engraving Methods. Each Piece is Hand Polished & Bevelled to Achieve a Mystical Refraction. Minimum Quantities Apply.