ABACO 20 RED AND BLUE
From 6 years old.
A new type of abacus. 22 x 6 cm plastic case with 2 rows of rotating balls. In the neutral position, the ball is gray. The child rotates the ball, which appears colored. An abacus consists of 2 rows of balls. Two models exist: 10 red balls and 10 white balls or 10 red balls and 10 blue balls.