Description:

Arithmetic Seal: Double headed design, with the upper cover for subtraction and the lower cover for addition. Improve children's oral calculation speed and accuracy.
The stamp is clear: the printing time is lasting. Quickly and clearly print questions and improve the speed of oral calculation.
Rotational Design: Change the subject. Each wheel has 10 numbers, various arrangements, random questions, and can be used repeatedly.
Portable: Square design, easy to store and make full use of space.
Refueling hole: can refuel, continuous use, each roller can add ink and recycle.

Specification:

Material: Plastic
Dimensions: 76mmx64mmx32mm/2.99inchx2.52inchx1.26inch

Size Chart:

Package Includes:

1 Roller Digital Teaching Stamp
1 Bottle Ink

Note:

Please allow slightly errors due to manual measurement and different monitors.