Each block measures approximately 1 3/8" square . Each block has 6 sides..three of the sides contain a different letter of the alphabet, two of the sides have a letter as pictured in color with a border. The third side has a different letter of the alphabet outlined in ink. The remaining three sides have an outline of a number and pictures. For example a kite, grapes and butterfly. See photos. Made up of lightweight and superior quality wood and non-toxic colors.