This ruler set allows for learning aligned with textbook content. This is a 5-piece ruler set for arithmetic, contained in an easy-to-see plastic case. The case has guide lines, making it easy to store the rulers in their designated positions. The rulers are made of durable, highly transparent methacrylic resin. They feature edge markings to prevent errors when starting to read measurements. The set includes a protractor that uses color-coding for each angle, making it easy to visually recognize angles. The set also includes edge markings and grid markings, which are convenient for learning about "parallel" and "perpendicular" lines. The protractor uses color-coding to distinguish the angles being measured, ensuring accurate angle measurement. [Straight Ruler, Triangle Ruler Set, Arithmetic, School Supplies, Elementary School Stationery, Entrance/Enrollment, School, Protractor] ◆ Set Contents: 15cm Straight Ruler, Right Triangle Ruler, Right Isosceles Triangle Ruler, Protractor, Mini Ruler ◆ Country of Origin: China ◆ Materials: (15cm Ruler, Triangle Ruler, Protractor) PMMA, (Mini Ruler) PVC, (Case) PS ◆ Measurement Specifications: (Straight Ruler) 15cm, (Mini Ruler) 9cm, (Triangle Ruler) 10cm, (Protractor) 9cm diameter Stationery "Arithmetic Ruler Set AP01A" KUTSUWA This ruler set allows for learning aligned with textbook content. This is a 5-piece ruler set for arithmetic, contained in an easy-to-see plastic case. The case has guide lines, making it easy to store the rulers in their designated positions. The rulers are made of durable, highly transparent methacrylic resin. They feature edge markings to prevent errors when starting to read measurements. The triangle rulers use color-coding for each angle, making it easy to visually recognize angles. The set also includes edge markings and grid markings, which are convenient for learning about "parallel" and "perpendicular" lines. The protractor uses color-coding to distinguish the angles being measured, ensuring accurate angle measurement. [Straight Ruler, Triangle Ruler Set, Arithmetic, School Supplies, Elementary School Stationery, Entrance/Enrollment, School, Protractor] ◆ Set Contents: 15cm Straight Ruler, Right Triangle Ruler, Right Isosceles Triangle Ruler, Protractor, Mini Ruler ◆ Country of Origin: China ◆ Materials: (15cm Ruler, Triangle Ruler, Protractor) PMMA, (Mini Ruler) PVC, (Case) PS ◆ Measurement Specifications: (Straight Ruler) 15cm, (Mini Ruler) 9cm, (Triangle Ruler) 10cm, (Protractor) 9cm diameter *Although unused and unopened, please understand that this item has been stored at home before purchasing.