1. Size 2 large transparent triangle rulers. The rightangle sides of the 45/90degree ruler measure 12 cm/4.7 inches and 9 cm/3.5 inches. The 30/60degree ruler has a longer beveled side of 13 cm/5 inches and a shorter rightangle side of 8 cm/3.15 inches. 2. Material Made of durable polystyrene plastic, these triangular rulers are resistant to breakage even with prolonged use. They are compact enough to fit in a pencil case or on a desk for spacesaving storage. 3. Feature The hollow center of the 45/90degree triangle includes a protractor for measuring angles from 0 to 180 degrees with precise 1degree increments, ensuring quick and accurate measurements. 4. Application These measuring ruler kits are ideal for drawing and measuring geometric shapes, providing convenience for various uses in classrooms, offices, or at home. They are suitable for artists, designers, architects, engineers, and more.