Features 1. Digital Teaching Stamp Roller: Adjustable numbers, gently rolling, can efficiently and quickly print out math practice questions within 100, it is a fun and meaningful gift for your children and friends& 39; children 2. Improve the Efficiency of Learning: You can quickly prepare math problems for your kids at home, just roll the stamp, you can quickly print math problems, and it dries quickly, convenient and practical. Arrangement needs to be changed every 10 math problems to avoid duplication. 3. Quick Addition and Subtraction: You can quickly prepare math problems for your kids at home, just roll the stamp, you can quickly print math problems, and it dries quickly, convenient and practical.Arrangement needs to be changed every 10 math problems to avoid duplication. 4. Reusable: Small and exquisite, easy to carry, and can be reused after adding 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 Include: 4x Math Roller Stamp