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Product Features:- *Training their ability to differentiate all kinds of different articles. *Develop your talent and intelligence. *Improve kid's painting ability. *Perfect for age 8 years and up kids Geometric Ruler, Method of use Choose any external gear, In the two inner circles You can draw different graphics right hand holding a ball-point pen insert pen perpendicular to the paper, in a certain direction, to draw a beautiful curve pattern. I use different color painting pen caps, and the decorative pattern looks more beautiful. Primary school students with the best intelligence toys can cultivate the habit of correctly. Hands and brain, the development intelligence, the fun. Need to change into another or more than two gears, gear was successively on the original painting, constitute a more complex pattern, pay attention to, when to change gear, don't let internal gear to move. Illustration can draw ten million different decorative pattern curve patterns.