Both boys and girls will enjoy the primary colors with the letters “A” through “D” on each of the cubes.  The manufacturer increased the density of the foam to provide firm support for "kids" of any size. Lightweight, yet very sturdy the blocks make a great seat, table or toy.Each cube measures 15 ½ inch square and is made from high density fire retardant foam. The fabric grade canvas cover is removable for cleaning.