This is a periscope model, made of plastic materials and good craftsmanship, and can be used for a long time. The detachable design makes this periscope convenient to use. It can be used not only as children's toys but also as props for optical experiments. In addition, it is also a holiday gift for child. Features -Color: Black. -Material: Plastic. -Size: About 30.00X6.00X4.50cm/11.79X2.36X1.77in. - Made of plastic, strong and practical, durable to use. Great toy for teens to play with. - Periscope is an optical instrument that uses the principle of light reflection so this simple periscope can be as the teaching tool - The periscope with detachable and splicing design is convenient to carry and store - Suitable for children to experience the fun of optics physical experiment in the process of playing this fun gadget - Put education in fun, cultivate scientific knowledge. Perfect for any school, or home use Package list: 1 x periscope model