This is the Xnova 4025-1120KV 1.5Y Brushless Motor with a 6mm "Type C" 32mm Shaft. This high performance brushless motor was developed for hard 3D flying on 6S.
"C Shaft" 32mm long, 5mm diameter
Good for hard 3D on 6S
High quality Neo Magnets, heat resistant up to 150 degree C
Specialized wires, heat resistance up to 250 degree C