139+Pcs DIY Metal Puzzle Model Kit 3D Assembly Mechanical Jigsaw Craft for Home Decor Price_$100-$200 Value: Can be used as

Value: Can be used as a teaching aid to understand and learn Stirling engine structure and principles

Package Dimensions: 52 x 38 x 23cm

Simulated Smoking: Add vegetable oil to the chimney at the back of the excavator for a realistic smoking effect (vegetable oil needs to be prepared by yourself)

SC6V3000 mAh battery

139+Pcs DIY Metal Puzzle Model Kit 3D Assembly Mechanical Jigsaw Craft for Home Decor Price_$100-$200 Value: Can be used as139+Pcs DIY Metal Puzzle Model Kit 3D Assembly Mechanical Jigsaw Craft for Home DecorFeatures: Made of high quality laser cuting ultra precise metal Don't need glue when assembling. Metal model can be assembled by screws to connect and according to the assembly drawing There are 139+ parts in total, and it takes about 1. 5 hours to assemble, but depend on yourself ability. Amazing details and wonderful DIY experience The edges of pieces are sharp,