Material: Made of high-quality K9 optical glass, which can effectively disperse the spectrum, create a beautiful rainbow, and create an elegant artistic atmosphere. Size 6inch/150mm. Physics Experiment Classroom: These highly transparent prisms are safe and environmentally friendly. The effects of light refraction can be demonstrated to students through optical lenses. Art Photography: Photographers can use this glass prism to create a unique world of light and shadow, adding a mysterious, romantic or atmosphere to photos. Gift Idea: It is very suitable as a gift for artists, photographers, and teachers to use in outdoor landscapes, scientific experiments, and social activities.<br><br>Colour:Transparent Material:Glass<br><br>Package Contents: 4x Triangular Prism<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.