This Measuring Ruler is made of wood material, safe and to use, not easily deform, can be used for a long time. This ruler can easily meet your different needs, it is a necessary tool for studying, woodworking, engineering, drawing and much more. You can carry it in your bag, which is light enough. Features -Color:Assorted Color -Material:Wood -Size:15.00X2.50X0.30cm/5.90X0.98X0.12in -Size:20.00X2.50X0.30cm/7.87X0.98X0.12in -Size:30.00X2.50X0.30cm/11.79X0.98X0.12in -Made of wood material, it features high hardness and strong elasticity. -It is easy to store and locate your rulers and easy when you start your drawing, measuring and so on. -The ruler is useful measuring tools for artists, designers, architects, engineers, students. -This wooden ruler is not easy to break, so enough to accompany by you through many years. -This and practical measuring ruler is always provided by us. Package list: 12 Rulers