1[ Digital Teaching Stamp Roller ] The Roller Digital Teaching Stamp brings a convenient way for addition and subtraction games. Gently scrolling and math problems will appear right in front of you. It can efficiently and quickly print out about 100 math problems. 2[ Adjuatable Design ] Rotate and adjust the column type, the Addition and Subtraction Seal can adjust different queue methods. Simply twist the button to change the question. Develop children's logical calculation ability. 3[ Durable Using Time ] The print of the Roller Math Stamp lasts for a long time, the stamping is clear, does not smudge the ink, and the print is clear. Say goodbye to handwritten addition and subtraction math problems, and use the seal to save you more time. 4[ Portable Size ] The Math Teaching Roller Stamp is small and exquisite, and comes with a roller box for easy carry. When the ink is used up, you can fill it on the roller side. 5[ Perfect Gift for Kids ] The Addition and Subtraction Game Math Learning Tool is a great learning gift and a very good early childhood learning toy, perfect for toddlers. The Roller Digital Teaching Stamp is small and exquisite, easy to carry, and can add ink for reuse. The print is clear, and it dries and does not fade after printing. 1. Save Time: You can quickly prepare math problems for your kids at home. 2. Convenient to use: You can print quickly by just scrolling through the math problems, and it dries quickly. 3. Practical learning and educational gift for kids' math learning. Specification: Name: Addition/ Subtraction Roller Stamp Size: about 4.4x3x4.8*cm/ 1.73x1.18x1.89in Material: PVC Model: Addition( pink ) /Subtraction (blue) Packing List: 1*Math Practice Roller Stamp