Description This item is a set of optical demonstrating model, which is a good tool for teaching. Made of acrylic material, it is clear and visual to see the path of light. Suitable for better demonstrating the light convergence to students. The product is in a simple design, but it is very useful and practical. Features - Color:Transparent. - Material:Acrylic. - Size:6.50X3.00X2.00 cm/2.55X1.18X0.79 inch. - It is made of premium acrylic material for durable and practical use. - Intuitive and specific, it is conducted to help students understand and learn. - Can be helpful for students to learn physics formula and the principle of light refraction. - Good for demonstrating optical principles and effects for students, learning about the properties of light. - Can be regarded as a great gift to children who are going to learn the principle of light convergence.Package list: 1 x Concave Len 1 x Convex Len