SAITO's only double-acting 3-cylinder steam engine. It is a 3-cylinder engine that is rare in the world and features smooth rotation with torque. Compatible kit: Polar Star, Neptune, Chibuster, Seagull. · Cylinder: Double movement (vertical type).· Diameter: 12mm · Stroke: 12mm · Valve model: Slide valve · No-load operation: 5,700r. INTERNATIONAL BUYERS - PLEASE NOTE? We do not mark merchandise values below value or mark items as gifts - US and International government regulations prohibit such behavior. This item is in the category "Toys & Hobbies\Radio Control & Control Line\RC Model Vehicle Parts & Accs\Body Parts & Interior\Boats & Watercraft". The seller is "unitedmind_0825" and is located in this country: JP. This item can be shipped worldwide.