Features: Five-piece Optical: Triangular prism/convex mirror/concave mirror/convex lens/concave lens. First Choices for Teaching: Very suitable for teacher, home, schools and also young scientists. Scope of Application: A large number of equipment in middle and high school physics laboratories. Complete Experiments: You can complete various mirror imaging, experiment various optical routine experiments, etc. Inspire Interest In Learning: Great experimental toy can help children learn the reflection and refraction of light, and cultivate childrens interest in physics and science. Specifications: Material: Plastic, Glass Color: As The Picture Shows Package Weight: approx.800g Specification Options: 5 Specifications are Available as Shown in the Picture. Size: approx.20x9.5x7.5cm/7.87x3.74x2.95in Package Includes: 1Pc x Physical Optics Mirror note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!