Brain Teaser Puzzles: This intelligence toy brain teaser puzzles are an old and traditional Chinese intelligence game. The puzzle simple, but it contains lots of mysteries. Classic Toy: These disentanglement unlock puzzle can train their children's ability to solve problems, develop intelligence, challenge your mind and patience. Development Toy: Puzzle disentanglement game fantastic item for children gift to exercise their brain. A great challenge for kids and adult intelligence. Nice Gift: This unlock interlock toy is classic intelligence IQ training game. It's helpful to keep your brain focused, expands your mind, exercise the logical thinking abilities. Material: These brain teaser puzzles made of quality material, smooth edge, sturdy. Suitable: Suitable for 4 years old and up. Size Chart: 7cmx7cmx7cm/2.76inchx2.76inchx2.76inch Package Includes: 13D Brain Teaser Puzzle Toy Note: 1.This is not infant toy , please take away from children to avoid eating. 2.Please allow slightly errors 1-2cm differences due to manual measurement.