Building blocks make a great gift and help extend children’s minds! Each set comes with 50 pieces in various colors including blue, yellow, red and green. Largest block measures 2 3/16″ X 11/18″ x 1/2″ and on the top of the block, there are 12 little nubs with 6 across and 2 down. Smallest block is 11/18″ X ? ” X 1/2″. Also includes tiny tires to make pieces move along with bodies to ride in cars. Comes packaged in a poly bag with header card. Not recommended for children under 3.