Brain Teasers, GRDE 6 Mind Puzzles Set, Brain Twister, the Conjunction of Hands and Brain, Separation and Installation (3 Metal 3 Wood Set) 6 PUZZLES SET, composed of 3 iron casting and 3 wood combinations, brain-twister of different materials and difficulty levels, easy to take apart, but difficult to put them back together Smooth product surface by fine grinding, no burr and round chamfer Original texture effect, the product looks more aesthetic as a whole Safe and environmental protection, security water-based paint in accordance with international standard, non-toxic, no smell Suitable age: 8 years old above. Good challenge for children and adults, develop your brain, flexible fingers, excellent educational toys