Item Name: EMAX GF2215/20 1200KV Outrunner Brushless Motor KV: 1200 Weight: 59g/2.08oz Stator dimensions: 22 x 15mm Shaft diameter: 5mm Recomended model weight: 300-1100g Color: black-silver-yellow (random) Prop: 9"-10" 7.4V-11.1V Easy to revert output shaft direction; Adopts 0.2mm silicon steel- ensures high performance and low temperature; GT Series motors have a better compatibility with more different speed controllers and propellers; GT Series utilizes imported bearings; Compare to other series motors- the GT Series are more precise- lighter in weight and higher in efficiency