Description These are some physics optical lens used to understand the principle of light convergence more intuitively. Using acrylic materials, they are safe and durable for long time to use. Small size, easy to use, it can stimulate students' cognitive ability in physics and is a good helper in school teaching, offering you much more convenience. Features - Color: white. - Material: acrylic. - Size:6.00X3.00X1.00cm/2.36X1.18X0.39inch. - Made of acrylic materials, these optical lens are professional and durable for long time to use. - With different shape, can effectively explain the knowledge of optics with experiments. - It can stimulate students' cognitive ability in physics, also can be a good helper in school teaching. - Good tool to show how different aspects of lenses and light passing through and bending. - Easy to use and clean, save your time and efforts to enable you to have satisfying using feeling.Package list: 5 x optical lens