Description: DIY periscope toy, simple and easy to operation, for student kids physical experiment activities. Learn the principles of light propagation and planar mirror imaging, experience the joy of the experiment process. This DIY toy fostering children's scientific exploration and intelligence development, improve hands-on ability and thinking ability. Size:LxWxHApprox. 29x5.5x4cm/11.42x2.17x1.57 inch Material: Plastic Specification: How to assemble it? 1 Tear off the protective film of the plane mirror; 2 Load the plane mirror into the slot of the lens card; 3 Assemble connector, lens barrel and lens; 4 Once the rest of the assembly is complete, connect the connectors the periscope is completed. Note: the Diy periscope is buyers self-assembly, refering to the detailed steps. Package Includes: 1 x DIY Periscope Toy Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be 1-2mm error in size.