This is a spectacular magical art for you to put together and is made with paper entirely (except two little wood sticks). This “V-Twin Engine” has semi-realistic exterior and interior detail. The size is about 70% of real engine. It is powered by hand. All patterns of parts are printed on the high quality neutral pH and acid-freeheavy paper, which can last for many years and will not turn brittle and yellow or fades with age. All parts are to be cut out and folded. No paint applied. It looks pure and elegant. Various shadows created by different light sources make the appearance more 3D. Moveable parts include a crankshaft, 2 rods, and 2 pistons. It is handcrafted with ruler, white glue and X-acto knife. The origami-reinforced structure is applied in the body of engine (they will not be seen). The origami-reinforced structures make the model very rigid and keep the pieces in the accurate positions.