Mathematical exercise rolling seal: gently rolling, fast and efficient printing of mathematical problems. 2 Blue 2 Pink includes addition, subtraction, multiplication, and . Give your child an interesting and meaningful gift. Family learning: it can be set to 10 different permutations to meet all the numbers in the 1-100 algorithm. It is suitable for students' practice, parents' guidance and teachers' teaching. In order to avoid repetition, the permutation of 10 problems needs to be changed. Clean and tidy: the color will not fade after drying, clean and tidy, and the printing is clear. Interesting supplies: small and light. Cartoon color is the perfect choice for children. It is as interesting as a toy, making learning and exciting, and increasing children's interest in learning Reusable: Homeschool uses 4 bottles of ink to practice rolling . It can be reused after adding ink. Material: Plastic colour: As shown Package Contents: 4 x Roller Stamp 4 x ink Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.