Durable Ruler: Made of good quality plastic, safer, flexible and unbreakable plastic that won't break when bent, but avoid putting too much force on the straight ruler. Straight ruler: easily measure objects up to 12 inches or 30 cm and easily draw straight lines of exact lengths. Package includes: 20 transparent rulers in one pack, the size of this ruler is 12 x 1.1 inch (L x W), 0.04 inch thick, the measurement range is 12 inch/ 30 cm < p>Wide Application: A useful measurement tool for artists, designers, architects, engineers, students, etc. Suitable for school or college, office, home, etc. Just fold and store your pencil case. 2 Side measuring ruler: double-sided measuring ruler, the centimeter scale is on one edge of the ruler and the inch scale is on the other side; can meet your different measurement needs Color: clear Package: bags Weight: 18 grams Package: bags Package includes: 20 x plastic rulers Warm notice: < p>Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.