Quatro was a product range of the Lego construction toy, designed for children aged 1 to 3 years old. Quatro bricks are twice the length, height and width of Lego Duplo bricks (eight times the size in volume) and four times the length, height and width of traditional Lego bricks. Initially launched in 2004, they are designed to be easier for younger children to handle. Despite their size, they are compatible with Duplo bricks which are in turn compatible with traditional Lego bricks. The Quatro product line was discontinued in 2006.