This toy was tested by CPSC accepted third party laboratories. All passed. HIGH QUALITY: 72 pieces of naturally polished and smooth sanded hardwood. Packaged in a beautiful wooden storage box for easy storage. Suitable for ages 3 and up. Highly durable set for indoor or outdoor use, build your dream castle anytime, anywhere Development: Block play helps promote creativity, independent play, cooperative play, fine motor skills and hand-eye coordination. Children must consider proportion, symmetry