Description: Premium Material: 4 styles, addition, subtraction, multiplication and division, repeated use. Math Stamp is made of high quality material, durable, small size and portable.Type: Number Teaching Roller Stamp. Interesting teaching, let children like learning more.Features: Rolling math questions appear instantly, easy to operate and very fast. It can develop kids' logical calculation ability.Multifunction: Various algorithm questions, addition, subtraction, multiplication and division, adjustable flexibly, take your math scores next level.Reusable: The stamp is clear and the marks are durable, and it dries quickly. The package comes with stamp roller ink. Size Chart: 9cmx9cmx9cm or 3.54inchx3.54inchx3.54inch Package Includes: 1 Math Stamp1 Printing Ink Note: Please allow slightly errors due to manual measurement and different monitors.