The compass set typically includes a compass, ruler, protractor, pencil, eraser, and other stationery to meet the needs of students or designers learning, drawing, and designing. The compass cover can draw circles with a diameter of 30 cm (11.81 in), sufficient for everyday tasks. Set A includes compass, pencil, eraser, sharpener, ruler, protractor and triangle; box size: 25.3 x 12 x 2.6 cm. Set B includes compass, lead core, eraser, ruler, protractor and triangle; box size: 9 x 18 x 2.5 cm. The mathematical compass comes with a storage box that is easy to carry and durable for long-term use. The contents are visible through the transparent cover. Use scenarios: - Geometry homework and classroom projects that require precise circles, arcs, lines, and angles. - Technical drawing, drafting, architecture, or design sketches where accuracy matters. - Arts and crafts projects that need clean circles and straight edges.