Train Logical ThinkingThis number teaching seal is able to develop your child's sense of space and facilitate kids' number thinking and problem-solving by setting up 10 different ways of queuing. Adjustable StampThe digital stamp can change different numbers to form math problems and scroll smoothly. And it supports efficient and fast printing of less than 100 math problems. Can Be Used RepeatedlyThe digital stamp for kids can be inked for reuse. The printing is clear, and the color does not fade after drying. The addition and subtraction seal contains the digital teaching seal and 1 bottle of ink. Best GiftsThe roller digital stamp is great for wonderful Christmas birthdays Easter gifts for kids and other occasions. This is a special gift for kids, family, and friends. Improve the Efficiency of LearningYou can print quickly by simply scrolling through the addition and subtraction seal, and it dries quickly. Pupils do one page a day to improve the speed and accuracy of oral arithmetic. Descriptions: The digital stamp can change different numbers to form math problems and scroll smoothly. The number teaching seal can cultivate children's sense of numbers and exercise logical thinking. Mathematical problems can be scrolled fastly by our addition and subtraction seal. Specifications: Size: 4.8*4.4 cm/1.8*1.7 inch Material: PVC Product List: Digital Stamp*4 Ink*4