Children's "Make Your Own Wind Up Clock" Kit: Learning & Development Toy Science Kit. Through the transparent clock casing children can actually see the actual mechanics of a working clock. Measures approximately 7" x 6" x 3". Suitable age 6 +

This kit comes with all the pieces you'll need to build your own clock. Assembling your clock is great training for your mind and your hands, and when it's completed, you get to watch the gears at work. Included is an instructional poster to help you construct. Clock measures approximately 6.25 inches tall when complete. No batteries required.