From Kikkerland:

• Build & use the periscope to teach your kids about mirrors, reflections, submarines and much more!
• Great hands-on learning experience!
• Let's see what's around the corner, over walls, or play submarine.
• Designer: Hector Serrano
• Product Measurement: (Assembled) 6,4 x 14,5 x 32,3 cm
• Material: kraft paper, acrylic mirror