The lenses are made of acrylic material that is an excellent tool for conducting optical experiments in the field of geometric optics. The lenses offer unique effects when used to demonstrate the phenomena of light reflection and refraction. Use it at home, in the classroom or at your science experiments, and more. Features -Color:As Shown -Material:Acrylic -Size:5.90X1.90X0.60cm/2.32X0.75X0.24in -Parallel lenses are professional and multi-functional for physical and geometric optics experiment. -Made of acrylic, sturdy, reusable, not easy to break, strong and durable for long time use. -Smooth surface and excellent light transmission. Ideal for exploring the light reflection and refraction. -Optics lenses are versatile and practical addition to any classroom or laboratory. -These parallel lenses for physical and geometric optics. Excellent tool for students and teachers to use in optical experiments and demonstrations. Packing list8 x Optical Lens