This Drawing Gears is a fun geometric drawing device. It's small portable size makes it ideal for creative moments during travels. It produces roulette curves also known as hypotrochoids and epitrochoids. Includes different rotating gears, a pen holder and a gear storage on the frame. Each element has holes to insert a colored pencil or pen.Eco-friendly sustainable material made of wood. No messy glue required. Clear colourful step-by-step assembly instructions. Very high precision laser-cut plywood with amazing details. All inclusive boxes, self assembly.