Hobbywing HW-30860500 FAN-2008SH-5V-15000RPM@5V-0.135A-BLACK 30860500 Cooling Fans Motor / ESC / Cooling Fan
Making use of this fan connected along with your ESC heatsink, you'll have the most cooling performance.
Specifications: Oil/Porous Bearing/Non-waterproof/JR-3P Male Plug/L=35mm
Applications: XERUN XR10 STOCK SPEC