This is the Xnova Lightning 4035-480Kv 2.5Y 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 helicopters for 10s up to 14s!