We are authorised Emax officials dealer for Pakistan we purchased directly from Emax. Out Emax certificate show above in pictures. You can verfiy with Emax. For more details contact us. Manufacturer  EMAXModel gt 4030 420kv Weight380 gVoltage :4s or 5s  or 6s supported GT4030 420KV High performance brushless motor with rotating casing, produced by EMAX!Ideal for classic model airplanes, trainer model, 3D models, gliders etc.Maximum thrust of:4900 gr thrust at 5S with 17x8 prop max amp 56A a 6200 rpm5400 gr thrust  at 6S with 16x8 prop max amp 60A a 8100 rpm