Description<br> These optical lens for physics teaching are made from good materials, being safe and durable to withstand long time using. These convex lens can help students learn and understand more specifically and obviously how to find the principle. Compact size, easy to take, use and clean, you will feel the convenience of them.<br> Features<br> -Color:Transparent<br> -Material:Acrylic<br> -Size:2.50X2.50X0.20cm/0.98X0.98X0.08in<br> - Made from goodmaterials, these optical lens are professional and durable for long period to use.<br> - Practical convex lens can effectively explain the knowledge of optics with experiments.<br> - Science teaching tools can stimulate students' cognitive ability in physics, also can be a good helper in school teaching.<br> - Good tool to show how different aspects of lenses and light passing through and bending, of multiple uses.<br> - Easy to use and clean, save your time and efforts to let you have satisfying using feeling.Package list: 60 x optical lens