Material: PVC Category: Teaching Stamps Model: blue addition, pink subtraction Imprint: 20*4mm Size: 44*30*48mm Package List 1* Math Teaching Stamp 1* Ink 1* Storage Box Due to the lighting effects and shooting angles, there is a color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size. 11. Number teaching stamp - Addition and Subtraction, Fun Drawings, numbers 1-100. A fun and meaningful gift for your child or your friend's child 22. Rotating adjustable design - 10 different queue modes can be adjusted. Satisfy all addition and subtraction numbers from 1-100. Develop children's logical calculation ability. 33. Efficient and fast math questions - You can quickly prepare math questions for your kids at home. You can quickly complete the quiz simply by scrolling through the math questions. 44. Reusable - Small and exquisite, easy to carry, can add ink for reuse. Includes digital teaching stamp, 1 bottle of ink, and 1 storage box. 55. Best gift - Keep the kids busy and get yourself a moment of quiet when they need it. So, it's a great gift for our kids and even for parents.