Fan Rib Material: Plasticstrong wind, to cool you off.Adjustment fan angle to meet your needs - Three Wind Power Selections.Lightweight and fashionable design, no burden when doing sports,Fan chute design to block plugs to prevent loosening and falling off of wires.High Strength and High Temperature Resistance.Description：The high precision fan blades and assembly technology of nine impellers make the fans more stable and quiet.The fan shape is designed according to the arc compression principle. The cold air can reduce the internal temperature by 20% through the arc pressure.High-precision balanced blades do not vibrate significantly at high rotational speeds.Injection Molding with PC Environmental Protection Material with High Strength, High Temperature Resistance and High Air Volume.