Difficulty level: ★★★★★☆☆, Number of parts: 307, Finished product size: L19cm x W5.2cm x H16.2cm [Made of metal material, improves the texture of the finished product] Made of SUS430 stainless steel, which has excellent workability and is highly versatile, the finished product will remain as good as new even if left for a long time. [Special assembly method that does not require adhesive] Cut the parts using a special tool, and use the workability of metal to fold the parts according to the instructions in the manual to make them three-dimensional. Pass the connecting part through the hole, then fold the connecting part to secure the parts. Please see the instruction manual for details. [Piececool 3D Puzzle Companion] Our 3D puzzles are detailed and have a special assembly method, so we recommend using special tools. The finished product can be made more beautiful with special tools. [Please note] The parts of this product are small and detailed. The difficulty level is higher than normal 3D puzzles and is suitable for intermediate players. Assembly can take a long time and requires concentration and patience. Target age: 16 years or older Piececool 3D Metallic Nano Puzzle: Black Pearl & Tool Set, Metal 3D Puzzle, Number of Pieces: 307