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.