Feature:1. Fully injectionmolded compound, high rigidity and hardness, greatly reduces damage rate.2. Perfect dynamic balance of the blades and good coordination between the fan ducts.3. More stable, has been tested for good aerodynamics, and has excellent power.4. Compatible for QF26113300 or 4000 or 4600 or 5000KV brushless motor, fit for most RC plane.5. Made of high quality material, which makes it durable, sturdy and has a long service life.Specification:Item Type: RC Ducted FanMaterial: PlasticColor: BlackDucted Fan Length: Approx. 39.08mm or 1.5inDucted Fan Mouth Maximum Diameter: Approx. 63mm or 2.5inDucted Fan Inner Diameter: Approx. 54mm or 2.1inWeight: Approx. 46.0g or 1.6ozNumber of Paddle: 12PcsFit for QF26113300 or 4000 or 4600 or 5000KV Brushless Motor.Package List:1 x Propeller1 x Duide Ring1 x Ampty Ducted Fan1 x Fan Cap5 x Screw1 x Main Shaft2 x Inner Hex ScrewNote:1. Manual measurement, please allow 13mm or 0.040.12in error, thank you.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Does not include motor