Emax Eco II is great motor at an affordable price. The motor is very well made. Even in this price range, it uses 7075 alloy and the rounded N52 magnets commonly found on the best motors. The shaft is steel.
The 2004 1600Kv design is especially suitable for 4" or 5" ultralights when using a 6S battery. Thanks to the t-mount (2 bolt propeller attachment) the motor retains a light weight of 16.4g.