Features: brand new and high quality Adopt advanced technology and craftsmanship to ensure the practical function, quality and beauty of the product. Not only cleanable, but also flexible and sturdy, you can use them for a long for time without worrying about it being broken. Available for ballpoint pen, pencil, markers, color pen, various usage lines, dots, and a lot of symbols, great tool for scrap-booking, gift card, craft and school project, also can be bookmark, avoid screens and develop learning, communication and creation skills. This hollow rulers set are for ideal for art design, fractional measurement, building formwork, architecture, network technique and drawing templates in shool, office, home. Hollow ruler makes it possible for aspiring artists of all ages to create exquisite and sophisticated designs. Specifications: Material:Plastic Color:Transparent Size:As Picture Shown Recommended Age:7-14 Package Includes: 4 Package(A/B/C/D Optional) Package A:22 Component Ruler Accessories Package B:A Ruler Accessories Package C:B Ruler Accessories Package D:Square Ruler Accessories note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.