AEORC 64mm 8 Blades Ducted Fan EDF With 3900KV 4750KV 5250KV MotorDescription:Brand:AEORCItem No.: ADF64-28L PlusItem Name: 8 blades EDFMotor KV:  3900KV 4750KV 5250KV Motor(Optional)Volts:10~12.6VAmps:31.2~41.8RPM:32700~32900Thrust:512g~720gWatt:312~526.7Efficiency:1.37~1.64g\/WWeight:76gPackage Included:1 x AEORC ADF64-28L Plus EDF