Description: 【MATH RULE】: The math ruler for geometry drawing and math lessons, suitable for classroom, school or office. Helping learn the features of parallelograms, trapezoids and triangles intuitively. 【EASY TO USE】: Math calculation toy is light in weight, the teaching ruler is easy to hold, perfect drawing aid for teachers. A good choice for teachers and students, also a perfect gift for your kids, and easy to take. 【CLEAR NUMBERS】: Quadrilateral splicing rods is design measurements with clear numbers; with good flexibility, pulling the finished quadrilateral slowly to both sides will create different parallelograms. 【HIGH QUALITY】: The Intelligent learning toys are made of durable pp material, wear resistant, not easy to deform, and will not scratch your hands. Easy to use students hands- on ability to stimulate students interest in learning. 【WIDE APPLICATION】: The Mathematical Geometry Tool kit is an essential tool for students and teachers. It cultivates kids interest math learning. Size Chart: 15/12/10/8/5cm Package Includes: 1 Set of Polygon Splicing Bars Note: Please allow slightly errors due to manual measurement and different monitors.