Premium Material: Crafted from quality and eco friendly wood, this mechanical puzzle box is smooth to the touch and of burrs, ensuring a safe and long term experienceEasy and Engaging Assembly: Designed for ease of assembly, this mechanical password box offers a challenging yet enjoyable experience that you can share with your children and family membersUnique Design: Featuring a distinctive interlocking design, this DIY science experiment requires no tools for assembly, providing fun as you piece it togetherEducational Project: This wooden assembly toy is both beneficial and entertaining for teenagers and adults alike, making it an educational tool that stimulates creativity and problem solving skillsComplete Package: The assembled kids puzzle locks box measures 10cmx10cmx14.5cm/3.94inchx3.94inchx5.71inch and comes with everything you need in the package,ensuring a complete DIY experience right out of the box Specification: Material: Wood Size Chart: 10cmx10cmx14.5cm/3.94inchx3.94inchx5.71inch Package Includes: 1 DIY Mechanical Password Box 1Screwdriver Note: 1. This is not an infant toy, please take it away from children to avoid eating.2. Please allow slight errors of 1-2cm differences due to manual measurement.