- Faber-Castell 66021 school set composed of a 30 cm ruler, 180° protractor, and two triangular set squares - Made of transparent plastic in bright green color for optimal measurement visibility - Clearly visible graduations and numbers for exact and precise measurements - Includes protective case to easily organize and transport the pieces - Perfect for students, professionals, and technicians in geometric and technical drawing - Durable material that ensures longevity and precision in daily use