Grinding Wheel Cooling Features and Longevity

What happens here

Garren then explains *why* the grinding wheel cuts rather than melts materials like plastic. He asks the host to feel the wheel after extensive use, noting it's only slightly warm. He attributes this to the eight strategically placed cooling slots in the wheel's design, which prevent heat buildup. He highlights that this redesigned version, unlike their original, maintains a lower temperature, increasing both safety and longevity. He states the average life expectancy is about 100 times that of a normal fiber wheel and confirms that these wheels also come with a lifetime replacement guarantee.

Goal: Explain the cooling mechanism and extended lifespan of the grinding wheels.