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QFkris 4pcs Clear K9 Crystal Triangular Prism for Photo Rainbow Lights Crystal Optical Prisms Glass Physics Teaching Refracted Light Spectrum Students Presents Gift,50mm/2inch auspowers_batchsix strengthens ventilationQFkris 4pcs Clear K9 Crystal Triangular Prism for Photo Rainbow Lights Crystal Optical Prisms Glass Physics Teaching Refracted Light Spectrum Students Presents Gift,50mm 2inch Product Features Experience Stunning Rainbows and Flare Effects Our high quality K9 optical glass prism splits beams of light into the perfect angle, creating beautiful and vibrant rainbows and halo effects. please note the effect depends on the power of light. Perfect for