Montessori Math Decomposition Ruler Kindergarten Children Numbers Addition and Subtraction Arithmetic Enlightenment Teaching Aids, Length: 25.5cm(Blue)

1. Double-sided use, addition and subtraction within 10 on the front side and within 20 on the back side.
2. Rounded corners, rounded and smooth without hurting your hands.
3. Thickened material, not easy to break
4. Clear printing, not easy to lose paint
5. Material: plastic
6. Size: about 25.5cm
7. Weight: about 48g