Features 1. Digital Teaching Stamp Roller: Featuring adjustable numbers, this gently rolling stamp efficiently prints math practice questions up to 100. It��s an enjoyable and thoughtful gift for your children and their friends. 2. Boost Learning Efficiency: Quickly prepare math problems at home; simply roll the stamp to print problems that dry fast, making it convenient and practical. Remember to change the arrangement every 10 math problems to avoid repeats. 3. Quick Addition and Subtraction: This tool allows rapid preparation of math challenges for home practice. Just roll and print, with fast drying for convenience. Arrangements should be adjusted after every 10 problems to prevent duplication. 4. Reusable: Small and stylish, it's easy to carry and can be reused with new ink. The impressions are clear, colors remain vibrant after drying, and smudging is minimized. 5. Educational Gift: This makes a wonderful gift, enabling parents to quickly prepare math exercises for children, who can also prepare for each other and learn collaboratively. Specification Material: Plastic Color: Pink, Blue Size: 10 x 10 x 5 cm Weight: 320 g Package Includes: 4x Math Roller Stamp