Kongming lock is a traditional Chinese intellectual toy, originating from mortise and tenon structure in ancient architecture. It's intangible cultural heritage & ancient wisdom. mideer neon series is made of ABS material with smooth touch. Solid structure & easy interlock for kids. It can help improve kids' logical thinking, imagination, concentration, patience. Age : 3+ Box Measures : 2.87" x 2.87" x 2.87" Including: 1 puzzle, 1 instruction Piece Count : 13 pieces Colors: Blue Material: ABS