Box of cubes wood learning multiplication

Wooden cube box for learning multiplication tables. 81 boxes at the bottom of which is noted for each the result of the multiplication, it is then necessary that the child finds the right cube to pose! On each cube is noted on one side the calculation and on the opposite side the result, there are 81 cubes! The box is made of white wood closed by a plastic board! It can be put without the risk of dropping a cube! Dimensions: box 18 cm side, cubes 1.5 cm side, weight of the set 300g. Vintage 2000, box that I bought for learning multiplication tables for my sons!.