Description Description: Adjustable Numbers: Digital teaching stamp roller rolls numbers, which can efficiently and quickly print out math multiplication practice questions, easy to operate, and very fast. Clear Print: This math roller stamp comes with premium printing ink which is suitable for most paper, stamping is clear and the marks are durable. Quick Addition and Subtraction: Just need a sheet paper, roll the stamp, and you can quickly print math problems, perfect for students to practice parent guidance and teacher teaching. Lightweight and Practical: The multiplication roller stamp is small and exquisite to carry. Perfect Gift for Children: The math practice tool is a unique gift for children to improve their math skills, and develop kids logical calculation ability. Specification: Material: ABS Size Chart: 5cmx7.8cmx3cm/1.97inchx3.07inchx1.18inch Package Includes: 1 Math Roller Stamp 1 Carrying Box 1 Printing Ink Note: Please allow slightly errors due to manual measurement and different monitors.