Adventure Spiral Marble Run 3D Wooden Puzzles for Adults and Teens DIY Model Building Kits with Mechanical PuzzlesSPECIFICATIONS Fun DIY Building Kit Wooden Marble Run Puzzle. Creative Puzzles with Wheels, Gears and Slide Tracks. Have fun building the kit and structure and then also enjoy the Marble Run afterwards. Great Fun for the Whole Family. Helps Hand Eye Coordination Building skills. Select Puzzle Type from the Variations Menu. Assemble Time: About 1 hour Material: Wood Gender: Unisex Puzzle Style: 3D Puzzle Type: Marble Run For: Kids, Teens and Adults