Piececool 3D Puzzle, Metal Steam Locomotive Big Boy, Assembly Required, No Glue Required, 5-Star Difficulty, Intermediate/Adult

Difficulty: ★★★★★☆☆, Number of Parts: 646, Finished Product Size: L40.3cm x W3cm x H5.5cm [Made of Metal for a High-Quality Finished Product] Made with versatile SUS430 stainless steel, which is easy to process, the metal's unique texture and design faithfully recreates the realism of the finished product. [Special Assembly Method, No Glue Required] Cut out the pieces with a special tool and fold them according to the instructions, utilizing the metal's workability. Pass the connecting pieces through the holes and then fold them to secure the pieces. See the instruction manual for details. [Your Partner for Piececool 3D Puzzles] Our 3D puzzles are detailed and require a special assembly method, so we recommend using special tools. Using special tools will enhance the finished product. [Please Note] The parts in this product are small and intricate. The difficulty level is higher than that of standard 3D puzzles and is intended for intermediate players. Assembly may take a long time, requiring concentration and patience.