E-flite?s latest Park 370 is a brushless outrunner motor that features a 4mm hollow shaft, ideal for use with variable pitch propellers. It?s perfectly designed for electric models equipped with variable-pitch propeller systems, such as the E-flite? ShowStopper VPP system. However, you don?t need a VPP to use this motor?it?s an excellent motor for small 3D airplanes that weigh 7?14 ounces. A motor mount, prop adapter and all hardware are included. ?