, high quality. Three-way parallel laser can improve their physics learning skills. Great for education and scientific research purposes. Our physical optics experiment laser is a great tool for you to conduct optical experiments. This physical optics experiment equipment is guaranteed to inspire students' curiosity and love for science. Our physical optics experiment laser is made of plastic to ensure easy portability. Size:Approx. 10x6cm/3.94x2.36Inch Colour:Green Material:Plastic Package Contents: 2 x Optical Experiment Laser Equipment 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.