Features: From transparent plastic with precisely etched markings, this ruler ensures accurate measurements every time, eliminating errors caused by obscured visibility during school projects or technical drafting. Featuring durability and rounded safety edges, these unbreakable plastic rulers outperform fragile glass alternatives while providing scratch resistant protections for users of all ages. for students, architects, artists, and STEM professional requiring measurement tool for geometry homework, engineering blueprints, or creative design sketches. Perfectly suited for classroom assignments, office documentation, art studio projects, and children craft activities where precisions and safety are equally prioritized. Environmentally users will appreciate the nontoxic, odorless construction meeting strict safety standards for school supplies and daily use stationery essential. Specifications: Materials: Plastic Size:15 20 30, 40 50 60(optional) Package Includes: 3Pcs Transparent Plastic Ruler note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.