Our photography prisms all made from the clearest crystal k9 material, no bubbles, distortions, color or inclusions with quality guarantee. Each one is carefully checked, no scratches are allowed. Package Included: 1 x 50mm crystal cube, 1 x 50 triangular prism, 1 x 50mm crystal ball, 1 x 50mm optical pyramid, with wiper cloth and box. If you want to take some amazing pictures, or some basic optical research, or as a gift for kids friends lover etc. this high quality K9 optical crystal photography prism set are highly recommend to you. The clear crystal set are believed to clear our mind and absorb sunshine / moonlight too. Can add brightness and harmony to your life space or studio, also can use them for decoration or teaching. Like showing the rainbow and science physics teaching photography crystal equilateral fractal spectrum prism. Can be used as a gift for kids,students,teachers in the opening season,showing as a gift for Children`s day,Teacher`s day,Christmas,New Year,Birthday or some festivals.