The semi-metal compass in red and purple color is an instrument used for drawing circles and arcs. It consists of two parts: one rod and another movable part that can slide along the first one, creating different radii for circles. The ends of the rods are equipped with sharp tips for precise line drawing on paper or other surfaces. The body of the compass is made of metal, ensuring durability and reliability. The red and purple colors give it a bright and attractive appearance, making it stand out among other school supplies.