[ Portable Size ] The Roller Digital Teaching Stamp is small and exquisite, and comes with a storage box for easy carry. When the ink is used up, you can fill it on the roller side. [ Digital Teaching Stamp Roller ] The Addition and Subtraction Roller 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. [ Durable Using Time ] The imprint of the Kids Math Learning Tool lasts for a long time, the stamping is clear, does not smudge the ink, and the imprint is clear. Say goodbye to handwritten addition and subtraction math problems, and use the seal to save you more time. [ Perfect Gift ] The Math Roller Stamp is the perfect learning toy for your toddlers. Get this and put a smile on their faces. It is a great gift for birthdays, Christmas, Halloween, Thanksgiving and New Year. [ Adjuatable Design ] Rotate and adjust the column type, the Math Practice Number Rolling Stamp can adjust different queue methods. Simply twist the button to change the question. Develop children's logical calculation ability. Descriptions: The Additive and Subtractive Roller Stamp is small and exquisite, easy to carry, and can add ink for reuse. The imprint is clear, dries, and does not fade after printing. Features: 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 gifts for kids' math learning. Specification: Name: Addition and Subtraction Roller Stamp Weight: about 69g Size: about 4.8*4.4*3cm/ 1.88x1.73x1.18in Material: PVC Model: Addition/Subtraction Packing List: 1*Math Practice Number Rolling Stamp 1*ink