Production Model : AIP005 - AIP High Torque Motor tunes up your Airsoft AEG with low price & high performance - Caution for High Magnetism - High Torque motor bring your AEG to next level - Able to Increase your AEG Muzzle Velocity / FPS (Recommend to use with the High Power Spring) (Note: Self-assembly is required, consult expertise if needed) Major Color : Black Built Material : Metal