This is a Duplo block set. It includes the colors red, blue, green, white, and yellow. There are 10 blocks of each color, for a total of 50 blocks. Each block is 3.2cm x 3.2cm x 1.9cm (height), and they are all the same size. They show some signs of use, but are still usable. They have been washed with a neutral detergent before listing. They will be shipped stacked together.