Product Smart Math Roller Stamps For Math Problems: one addition stamp, one subtraction stamp, 2 bottles of inkInteresting School Supplies:The math stamp set as fun as toys, makes learning fun and exciting, increase children"s interest in learning suitable for students to practice, parent guidance, teacher teachingSave Time: Easy to operate the math questions can appear in front of you by scrolling the stamp, which can be adjusted, and the questions can be changed by gently twisting the button, and the questions will be randomly selected.Refill Pack: DurableEquipped with 2 Free refills ink, open the oil cap and drop 5-6 drops at oncePackage include:2pcs/Set x Roller StampsNote:1. Due to the different monitor and lighting effect, the actual color of the item may be ightly different from the color shown on the pictures.2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm)Thanks for your support :)Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it