Numbers TeachingAddition, subtraction, multiplication and division 2 model, free choice, interesting pictures, numbers 1-100, a fun and meaningful gift for your child or your friend's child. Efficient and Fast Math QuestionsYou can quickly prepare math questions for your children at home, and you can quickly complete the quiz just by scrolling the math questions. Rotation adjustment designDifferent queuing modes can be adjusted to meet all addition and subtraction within 1-100, and cultivate children's logical calculation ability. ReusableSmall and exquisite, easy to carry, add ink for reuse, the product includes 1 digital teaching stamp, 1 bottle of ink. BEST GIFTKeep the kids busy and give yourself a quiet moment when they need it, so, this is a great gift for our kids or even parents. Description: Name: Mathematics Teaching Roller Seal Color: random color Stamp size: 44x30x48mm Model: Addition, Subtraction Material: PVC Package: 1pcs*stamp, 1pcs*ink Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 0.1-2cm measuring deviation due to manual measurement.