This optical lens for physics teaching are made from good glass materials, being safe and durable to withstand long time using. Compact size, easy to take, use and clean, you will feel the convenience of them. The lens size makes it versatile for various scenarios such as reading or watching TV. Features -Color:Transparent -Material:Glass -Size:6.00X6.00X0.30cm/2.36X2.36X0.12in -Magnification times:6x -Focal length:160mm -Lens power:300° -Center thickness:7mm -Edge thickness:2mm - Made of good glass material, these optical lens are with high durability to withstand long time using. - Well polished, smooth surface, and does not hurt hands when used, you can use with much more confidence. - Light weight and compact size, the optical lens is easy to carry and store, you will feel the huge convenience of them. - These clear optical lens can help learn and understand more specifically and how to find the principle. - Practical teaching tools whether for learning about the light or for teachers to conduct teaching. Package list: 1 x magnifying glass