The QiYi Kongming Lock Interlocked Intellectual Toy Set (9pcs) is made of high quality plastic that is strong and durable, with bright, delicate and smooth surface for comfortable hand feel. These crystal and clear toys look like areworks and comes with independent packaging. It is suitable for the elderly to relieve boredom and develop intelligence, children to promote wisdom, and youth to reduce the pressure of work. This cube set includes a storage box for easy carry and storage. Suitable to give as a gift. Recommended for 6+ years old.