Features: 1. Digital Teaching Stamp Roller: Adjustable numbers, gently rolling, can print efficiently and quickly. 2. Math skills development: Rotate and adjust the column type, you can adjust 10 different queue ways. Satisfy all addition and subtraction numbers from 1-100. Develop children39;s logical calculation ability. 3. You can quickly prepare math problems for your child at home. You can print quickly just by scrolling through the math problems, and it dries up quickly. 4. Small and exquisite, easy to carry, and can be reused after adding ink. The imprint is clear and does not fade after drying. 5. This addition and subtraction teaching stamp is a great gift for children on Christmas, Children39;s Day, birthdays and other festivals. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Reusable plastic Size: 8*8*4cm Package List: 1 set x Addition Subtraction Teaching Seal Stamp