Parcel: Including 1 piece wood Chinese style abacus.
One trillion, thirteen gears, 7 beads abacus, can meet general arithmetic requirements, study or using.
Smooth corners, do not hurt hands. ABS bead, resistant to falling, no peculiar smell.
The two beads in the upper row are counted as "5", the five beads in the lower row are counted as "1", when reachs to ten, then go to 1 to the next unit.
Suitable for adults and teenagers, but not kids, to avoid they swallow the beads.
