Image Item No. Description  3011pb032  Duplo, Brick 2 x 4 with Number 1 and Black and White Checkered Pattern Catalog: Parts: DUPLO, Brick, Decorated  2300pb010  Duplo, Brick 2 x 6 with Number 2 and Black and White Checkered Pattern Catalog: Parts: DUPLO, Brick, Decorated  2300pb011  Duplo, Brick 2 x 6 with Number 3 and Black and White Checkered Pattern Catalog: Parts: DUPLO, Brick, Decorated