The boxes made of wood with different colourful lids contain different set of cylinders.
Each set of the cylinders disposes of a special colour:
- Blue means: same diameter, different height
- Red means: same height, different diameter
- Yellow means: height and diameter synchronically declining
- Green means: height and diameter running in the opposite direction.
The product consists of 4 boxes with different colour lids containing 40 cylinders
Dimensions of the box: 7 X 15,5 X13 cm