This puzzle Luban lock set offers a classic brain-teasing challenge for children aged 6 to 12, packaged individually in an OPP bag. Each box contains 200 pieces, with each puzzle measuring 5x5x5 centimeters, making them compact and easy to handle. These interlocking wooden blocks are designed to build spatial reasoning and problem-solving skills through hands-on assembly and disassembly. Sold wholesale by the box.