Experience fascinating optics and science: With our four high-quality K9 crystal optical prisms, witness the stunning phenomenon of light refraction. Split light at perfect angles, creating striking and vivid rainbows or halo effects. A fun, exciting, and educational way to learn about physics, this prism is a perfect science tool. Capture unique photographic effects: Enhance your photography skills with our clear glass prism. Impressively useful for photographers, it adds a breathtaking glow of rainbow light to your images, requiring no editing, enhancing the visual appeal of your pictures. Designed for safe and interactive learning: With rounded edges, our prism is remarkably safe to handle, especially when used by young students. It's an exceptional tool for learning about the nature of light and how rainbows are created, making science education fun and engaging. Portable and ready to gift: Our 50mm prisms (4-pack) are convenient to carry, perfect for photography on the go or travel adventures. Color: Clear. Material: Glass. Size: Approx. 30 x 30 x 50 mm. Package Contents: 4 x Clear Triangular Prisms. Only the above package contents are included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.