This CNC Super High Speed Gear Set 13_1 boasts a unique price-quality ratio thanks to its precision manufacturing on state-of-the-art CNC machines. These gears, known as "Super High Speed", have varying diameters and fewer teeth, allowing for a 30-40% increase in rotation speed and resulting in a high rate of fire. For optimal performance, we recommend using a spring up to M120. These gears are compatible with most airsoft guns using gearbox types 2 and 3, but not suitable for weapons such as the SR25, SVD AEG, PSG, and L85. Made of steel with a weight of 70g, they are manufactured by AirsoftPro.