This set of foam dominoes can be used as simple flash cards for practicing and reinforcing key concepts in volume measurement, or as a game for up to four players.  It includes two sets of 24 colour-coded dominoes (48 pieces in all), with one set where students use formulas to match the written notation to labeled diagrams, and the other set where they use spatial reasoning to match diagrams to written notation.  Each domino measures 8 cm x 4 cm (about 3" x 1 1/2"), and the set comes with instructions and activity suggestions.