The Little Architect Master Builder 350 Pc 350 Big Mega Build Blocks ideal for kids aged 4-12, budding builder Develops creative thinking using an assortment of 350 pieces basic bricks in 7 colors & 10 Master Builder project cards. Award-Winning Toy to combine with other Little Architect Young Builders sets to create a world of building fun including moving and sliding parts, to build cars and more Fun on its own or to add to other Create 'n Play young products. Easy-open sturdy, Practical and Reusable Storage Box! Conforms to Safety Requirements ASTM and EN71