Kongming Luban Lock is a traditional Chinese intellectual game with a long history. It incorporates subtle mathematical and physical principles, making it easy to disassemble but challenging to reassemble. The compact design provides a great test of problem-solving skills and patience. This puzzle is simple to take apart, but very difficult to put back together—highly challenging. Features: 1. Made from solid bamboo. The surface is hand-polished for a smooth feel and comfortable handling. 2. The lock may appear simple, but it contains clever design elements that challenge your mind and test your patience. Easy to disassemble, difficult to reassemble. 3. Ideal for passing time, improving focus, and reducing reliance on electronic devices. 4. A healthy way to practice concentration and mindfulness. Also great for fun group activities or party games. 5. Perfect gift for any occasion, including Christmas or office exchanges. Portable 3D brain teaser suitable for all ages. Notice: 1. Actual color may vary slightly due to differences in monitor displays and lighting. Please allow 1–3 cm variation due to manual measurement. Specification: Material: Bamboo Size: 4.5 x 4.5 x 4.5 cm Includes: 13 x 3D Wooden Puzzle Kongming Locks