WTF 30x30mm Ultra High Speed Motor Cooling Fan
One of the most popular size for motor and heat sink, although its looks very similar to what's on the market, but its performance is above its classes. Max. RPM in 24,000 @8.4V. For greater ease of use, different extension are included in the packing.

Specifications:

Size - 30x30x10mm

Operating Voltage - 6V-8.4V

RPM @ 8.4V - 22000 ~ 24000

Current @ 8.4V - ~0.43A

Axial option - Available in ball bearings

Plug - JST