Calculation beads to perform (preparatory) calculation exercises with. The calculation beads have a 5 structure. Choice of: red / white or red / blue. The rope is 45 cm long and the beads themselves are 1 cm in size.

Red White

1 calculator bead (red / white) (size 45 cm)

Red / Blue

1 calculator bead (red / blue) (size 45 cm)