This is the Xnova Lightning 4035-400Kv 3Y Brushless Motor with a 6mm “Type A” 36mm Shaft. The “Lightning Series” was developed from the extremely successful XTS Platform. Lightning series motors are simply the pinnacle of performance, and efficiency. If you’re looking for the absolute best brushless motor within the Xnova line up, this is what you’re looking for! This is for 620-700 sized machine running on 12s.