The Arithmetic Trinomial Cube is a variation on the traditional Trinomial Cube both in the colours used and the way they are presented. The traditional Trinomial Cube has colour-matched surfaces to help figure out which pieces go where, while the Hierarchical cube pieces are all solid colours, making for a far more challenging exercise. The set contains twenty-seven pieces in all and the fully assembled cubes is 9 cm per side. The box has two hinged sides and a lid for secure storage.