The Prairie House Blocks set contains 68 blocks (plus the box and lid). The set includes many blocks that are identical to the Froebel Gift Sets in size and material. Ingeniously designed so the hip-roof style lid and the empty wooden box are used to create your architectural masterpiece. Box with roof lid measures 12.75 L x 3.81"W x 2.75"H. These sets contain small parts that are NOT suitable for children under 3 years. Intended for children ages 5 and above. Adult supervision recommended.