Our Math Problem Roller Stamps set is a fantastic tool for helping children master addition and multiplication. Each stamp in the set produces different math problems, making it easy to create a variety of exercises. Use these stamps during math lessons or homework sessions to make learning more interactive and fun. the stamp on paper and watch the problems appear. Features -Color:Assorted Color -Material:Plastic -Size:4.80X4.50X3.00cm/1.89X1.77X1.18in -Clear and lasting prints: the advanced light sensitive technology ensures that prints are clear and do not smudge, providing readability -Engaging learning tool: the adjustable feature allows for question generation, making math practice more engaging and less repetitive for kids -Instant math practice: with a simple roll, new math problems appear, offering a quick and interactive way to practice addition and multiplication -Seamless rolling action: the stamp rolls smoothly, allowing for efficient and quick printing of math exercises, making it userfriendly for children -Portable and handy: its compact and delicate design makes it easy to carry in a pencil case or pocket, ideal for Package list: 4 sets x math stamps with 4 ink