Description: 100% Brand new and high quality. The lock may look simple, but it contains lots of mysteries. In most cases, it is unable to untie the knot, but as long as you master the structure, is sure to solve. Challenge your mind and patience. Our product lets you know the challenge does not have the limit. Caution 1.Children must use it under the adult’s tutelage. 2.Don’t throw the away to each other. 3.Don’t use it if there is any problem. 4.Don’t keep the toy in the mouth in order to prevent children to devour small parts in the toy. Maintenance: Handle with care, avoid desiccation, being washed. About ULT-unite: If you have any question about our product or ULT-unite, please feel free to contact us. We will respond you in 24 hours ULT-unite is committed to delivering best in class and high quality products and services to all our customers. If you want to get great pleasure of game, just one thing you need-Our ULT-unite Wooden Cube Puzzles!