Large teaching compass for mathematics and daily circular drawing. This oversized compass is designed for classroom demonstrations and large-radius circle construction. Suction cup centering design provides stable fixation of the compass and the circle center on the drawing surface, helping to keep the center true and the arc accurate. Chalk and marker compatible, making drawing easier on chalkboards and whiteboards. Ideal for office and school use, and for lessons that require clear, large circles. Lightweight for its large size, reducing hand fatigue during extended use. Use scenarios - Classroom geometry demonstrations: draw large arcs and circles on a chalkboard or whiteboard to illustrate radius, diameter, and circumference. - Office or school diagramming: create large diagrams or layout sketches on boards for meetings or lessons. - Home or tutoring sessions: practice circle construction and geometry problems with clear, easy-to-see circles.