Citiblocs are all the same size and shape which enables building without borders. Our most popular item, the 200 piece set is a wonderful way to get the enthusiastic builder started building simple, medium-sized structures and even complex. Startlow and wide, and thenstack them high and narrow. Whatever your preference, the Citiblocs 200 piece set will keep the enthusiastic builder flexing his or her imagination while developing fine motor skills.