QUATRO was a new building system with bricks that are two times in scale of LEGO DUPLO bricks. The name "QUATRO" means four times larger than the traditional LEGO System. QUATRO bricks are compatible with DUPLO and System bricks. These pieces were baby-friendly, and were specially designed to endure teething. In addition, they are the largest-scale elements ever created
2004 was the first year for QUATRO starting off with 4 sets (5355-5358), all which include a plastic bucket to contain, store, and build from and had a lid that was a building plate to start creations on.
In the last year QUATRO brought out 3 sets, and the only QUATROFigure included in 5470.