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Optical Triangular 2 Inch K9 Glass for Light Dispersion and Teaching Aid

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K9 Grade Optical Glass Triangular 2 Inch for Rainbow Effects and Teaching

2 Inch Equilateral K9 Glass for Light Refraction and Classroom Activities

2 Inch K9 Optical Glass Triangular Shape for Rainbow Making and Teaching

2 Inch K9 Optical Glass Triangle for Light Refraction and Educational Use

K9 Optical Triangular 2 Inch for Educational For Light Refraction Tools