Ugears Pneumatic Engine ★Mechanical 3D Puzzle Kit Model Toys Gift Present Birthday Xmas Christmas Kids AdultsModel Size ( Length x Width x Height ) 162 X 78 X 100mm Package Size ( Length x Width x Height ) 37 x 14 x 3cm Package Weight 200g Number of Parts 81 Be a part of the once great era of steam with just a breath of air. The Pneumatic Engine is a small but fully functional example of a steam engine, except it uses air pressure instead of steam to set it in motion. Use an ordinary inflated balloon and watch the pistons and gears chug along just like the