These mini K9 crystal glass prism cubes are made of excellent optical glass with six-sided polishing process design for better refraction and clear reflection. They can be used for teaching physics, decoration, and photography, producing good filter effects. Portable and versatile, they are an ideal creative gift for children for spectrum learning. Features 1. Materials: The Square Cube Prism is made of excellent optical glass, durable and clear, Textured, with better refraction and clear reflection. 2. Unique Craftsmanship: The glass prism adopts six-sided polishing process design, exquisite and beautiful, the same environment, different angles, will show completely different color performances. 3. Portable Design: The glass prism is small size , so you can easily hold it in front of the camera lens and take special photos. Take it with you and don't take up space. 4. Features:Glass prisms are used in the appreciation of beautiful optics and the synthesis of experimental light during play. They are used to split the light beam into different spectral components which are displayed in rainbow colors. 5. Widely Application: The glass prisms can be used for teaching light spectrum physics or research tools, and can also be used for decoration and photography, which can produce good filter effects. Creative gift for children for physics spectrum learning. Specification Material: Glass Color: Multicolor Size: 7 x 7 mm, 10 x 10 mm, 12.7 x 12.7 mm, 18 x 18 mm, 23 x 23 mm, 25 x 25 mm Weight: 17 g, 22 g, 27 g, 32 g, 37 g Package Include: 1x Cubes Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.