[Digital Teaching Stamp Roller]Adjustable numbers, gently rolling, can efficiently and quickly print out practice questions within 100, it is a and meaningful gift for your children or friends' children. [Reusable]The for teachers elementary has 4 bottles of ink, you can add ink for repeated use. The color does not fade after drying, and it is not easy to smudge. [Improve the Efficiency of Learning]You can print quickly by simply scrolling through the addition and subtraction seal, and it dries quickly. Pupils do one page a day to improve the speed and accuracy of arithmetic. [Easy to Carry]The roller stamp size is 1.7 x 1.2 x 1.89 inches, which is small and exquisite, easy to carry. Can be placed in a stationery bag or pocket at any time. [Learning & Educational Gift]Keep Kids and Give Yourself a Moment of Quiet When They Need It. So It'S a Great Gift for Kids and Even Parents. Material: plastic Color: as shown Package Contents: 4 x stamp 4 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. stamp teacher multiplication