High-Quality Material: Constructed from PC, these fans resist high temperatures and aging, ensuring stable operation and a long lifespan even under extreme conditions. Efficient 9-Blade Design: Featuring a unique 9-piece sickle-shaped blade design, these fans optimize airflow and pressure with minimal noise, effectively cooling your system. Smart 4Pin PWM Control: Equipped with a 4Pin PWM interface for intelligent motherboard linkage, these fans automatically adjust speed based on system temperature, balancing optimal cooling with minimal noise. Ultra-Quiet Operation: Operating at a whisper-quiet, these fans a tranquil environment, perfect for intense gaming sessions or focused work late at night without disturbing your peace. Energy-Efficient Cooling: These fans provide robust cooling while being energy-efficient, reducing operational costs and benefiting both your wallet and the environment. Speed:800-1600RPM+10% Air volume:58 CFM+10% (MAX) Colour:Black Material:PC Size:12x12x2.5cm Package Contents: 1 * Computer case cooling fan 4 * Screw Accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.