Developed with the modern classroom in mind, Demonstration Clings are a vibrant, fun, colorful way to model mathematical strategies for the whole class. Made from an innovative new material, they cling to virtually any smooth, flat surface WITHOUT leaving any sticky residue! They provide a highly visual way for students to learn and explore addition, subtraction, multiplication, division, and fractions. Details: Algebra Tiles Demonstration Clings design 1.5'' x 13'' x 5.5'' 72 pieces Durable, reusable, washable For ages 10 and up