11-column teaching nine beads 2-color abacus white red white beads teachers can't use sliding beads for class demonstration
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Abacus Name: 11-Row Teaching Abacus with Non-slip Beads
Abacus Specification: Length 54cm Width: 27.8cm Height: 3.6cm
Abacus single weight 0.85 kilograms each
Abacus characteristics: non-slip beads, large teaching abacus, used for demonstration on the blackboard.