Various Arrangements Addition and subtraction 2 styles, free to choose.Rotate and adjust the column type, you can adjust 10 different queuing methods, and 100 different ways of using the column type. Add Ink Reusable Give practice questions efficiently and quickly, without smudging or fading. Simply the button to change the question Small and ExquisiteAddition and subtraction teaching seal can be placed in a stationery bag or pocket at any time. It has a storage box and can be carried with you. The roller-type digital teaching chapter frees parents' hands, just roll and print different addition and subtraction formulas on the paper Best GiftKeeping the children busy and get a moment of silence for yourself when you need. So,this is great gift for our children,even for parents. Professional Service If you have any questions, please feel free to contact us help you can refund or replace it. We will definitely reply to you within 24 hours and give you a satisfactory answer. Features: The roller-type digital teaching chapter liberates the parents' hands, just scroll and print different addition and subtraction formulas on the paper. Train students' verbal numeracy skills. Addition and subtraction 2 styles, free to choose. Roller design, combined adjustment. Add seal ink, which can be used repeatedly. Efficient and fast give practice questions, no smudge, no fading. Rotate to adjust 10 different count methods. Small and exquisite, easy to carry. Specification: Weight: 80g/0.17lb Material: PVC Style:A Addition/B Subtraction Imprint: 20*4mm Size: 4.4*3*4.8cm/1.7*1.2*1.9in Package Contents: 1pcs *Addition And Subtraction Seal Arithmetic Artifact (Contains seal ink)