Image Item No. Description By  3437  Duplo, Brick 2 x 2 Catalog: Parts: DUPLO, Brick 50  2302  Duplo, Brick 2 x 3 Slope Curved Catalog: Parts: DUPLO, Brick 10  2301  Duplo, Brick 2 x 3 x 2 Arch Inverted Catalog: Parts: DUPLO, Brick 8  3011  Duplo, Brick 2 x 4 Catalog: Parts: DUPLO, Brick 37  4198  Duplo, Brick 2 x 4 x 2 Rounded Ends Catalog: Parts: DUPLO, Brick 5  2300  Duplo, Brick 2 x 6 Catalog: Parts: DUPLO, Brick 12