An extremely popular item, the 300 piece CITIBLOCS set is a hefty way to get the enthusiastic builder started building simple, medium-sized and complex structures.  Start planning BLOCK party and a whole neighborhood of building fun.   The Citiblocs 300 piece set will keep the enthusiastic builder flexing his or her imagination while developing fine motor skills. You can expand your building horizons by combining this set with additional sets including the 52, 100, 200, 500, 800 and even 1,000 piece sets! All Citiblocs Wooden Building Sets are compatible and interchangeable with each other.