Lego Duplo ( also called Lego Preschool , Explore or simply just DUPLO ) is another type of Lego toys . Duplo ( trademarked as DUPLO ) is a product range of the construction toy Lego , designed for children aged 1 Â 1\/2 to 6 years old . Duplo bricks are twice the length , height and width of traditional Lego bricks ( eight times the size in volume ) , and are easier to handle - as well as being far harder to swallow - by younger children .