Designed with students and professionals in mind, this rolling ruler offers a unique combination of a measuring roller and a drafting slide ruler. Its ergonomic design ensures comfortable use, while the materials with durability. for mathematics, engineering, and artistic applications, it meets the diverse needs of its users. Features -Color:Transparent -Material:Plastic -Size:31.00X6.50X2.00cm/12.18X2.55X0.79in -Size:16.50X6.50X2.00cm/6.48X2.55X0.79in -Accurate measurements: provides accurate measurements for angles, circles, arcs, and parallel lines, essential for detailed drawings. -Versatile tool: suitable for a wide range of users including students, teachers, engineers, and designers, making it a versatile addition to any tools. -Portable and lightweight: made from transparent plastic, it is easy to carry and use anywhere, anytime. -Practical and convenient: a practical tool that simplifies complex tasks, making it easier to achieve professional results. -Educational tool: helps students enhance their manual skills and creativity, making learning more engaging . Package list: 1 X 30cm Parallel Ruler 1 X 15cm Parallel Ruler