Features 1. Digital Teaching Stamp Roller: Adjustable numbers, roll gently, can effectively and quickly print math practice questions within 100, it is a fun and meaningful gift for your children and friends' children. 2. Improve Learning Efficiency: You can quickly prepare math problems for your children at home, just roll the stamp, you can quickly print math problems, and it dries quickly, convenient and practical. The order needs to be changed every 10 math problems to avoid duplication. 3. Fast Addition and Subtraction: You can quickly prepare math problems for your children at home, just roll the stamp, you can quickly print math problems, and it dries quickly, convenient and practical. The order needs to be changed every 10 math problems to avoid duplication. 4. Reusable: Small and exquisite, easy to carry, and can be reused after refilling ink. The imprint is clear, the color does not fade after drying, and it is not easy to smudge. 5. Learning and Education Gift: This is a great gift, when children need to practice math problems, parents can quickly prepare them for them, and children can also prepare for each other and learn together. Specification Material: Plastic Color: Pink, Blue Size: 10 x 10 x 5 cm Weight: 320 g Package Includes: 4x Math Rolling Stamp