Master Builder 620 piece block set.. This Australian Made assortment of coloured bricks & faces also features 10 Master builder project cards and ten young builder cards. The Little Architect - Construction System is simple to use and features a unique, easy locking mechanism. These easy to use bricks permit the construction of wonderful patterns and structures that will provide children with hours of fun and enjoyment while enhancing important creative thinking, problem solving and fine motor co-ordination skills. The Little Architect activity cards provide ideas for getting children started with their own creative building projects. Now includes axles and wheels. Comes in plastic storage tray..