CitiBlocs - Cool Colors Precision Cut Building Blocks, 0BCTBSC100 are high quality wooden construction blocks that inspire both traditional and modern design! Blocks in this set come in blue, green, turquoise, dark green and natural colors! The secret behind CitiBlocs is that every piece is exactly the same shape and size. Each block is precisely cut from Grade A Radiata Pine from certified renewable forests in New Zealand. Building requires no glue, no snaps, no connectors and no magnets: just gravity, balance and imagination, making them both an educational and kid-friendly toy! Building with CitiBlocs is simple: just stack one block on top of another! Their specific size, shape and weight allows building that is simply not possible with other building toys. To top it off, CitiBlocs are certified safe and non-toxic, and have been tested and approved according to all Consumer Product Safely Improvement Act (CPSIA) regulations. CitiBlocs - Cool Colors Precision Cut Building Blocks, 0BCTBSC100 are recommended for children age 3 and up. From pre-school to elementary school to architecture students to corporate seminars, CitiBlocs are an ideal educational toy for home, playgroups, teachers, principals, professors and parents. The pleasure of accomplishment and success and discovery is inherent in CitiBlocs for builders of all ages. Give kids a chance to build the world, their world!