•100% Brand New and High Quality
•The numbers are adjustable, roll gently, quickly ask questions, and no longer have to count the questions.
•Rotating adjustment row type, adjustable 10 different line methods.
•Primary school students make one page a day to improve calculation speed and correctness, cute and practical.
•The mark is clear, the printing dries quickly, does not fade, and printing oil can be added for repeated use. Easy to use and fun.