You'll think it's wood until you pick it up! No splinters, firm but not heavy and no sharp wooden corners to worry about. These blocks are perfect for the youngest of architects! Details:BlondePackage dimensions: 7" x 7" WARNING: Choking hazard, small partsNot for children under 3 yearsContents:30 block pieces1 3/8" (3.5 cm) thickassorted "unit block" shapes and sizes