Gator-RC Flow-Thru Propeller Spinner for RC Model 63mm Black 2.5 inches Gator-RC Flow-Thru Spinner 63mm Black 2.5 inches HIgh Quality Spinner for RC Planes Flow-Thru Slots for Better Cooling CNC Aluminum Slotted and pitched Blackplate These Spinners are high quality, don't be fooled by the cheap plastic spinners!