These are some physics optical lens applied to understand the principle more intuitively. Adoptinggoodmaterials, they are safe and durable for long period to use. Small size, easy to use, these physics teaching lens can stimulate cognitive ability in physics, giving you more convenience.Additionally, this magnifying glass is lightweight and portable, making it convenient to carry and use anytime, anywhere. Features -Color:As Shown -Material:Acrylic -Size:2.50X2.50X0.20cm/0.98X0.98X0.08in - Made fromgoodmaterials, these optical lens are professional and durable for long period to use. - Practical convex lens can effectively explain the knowledge of optics with experiments. - Science teaching tools can stimulate 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, of multiple uses. - Easy to use and clean, save your time and efforts to let you have satisfying using feeling.Package list: 12 x optical lens