What is the function of tire hairs?

[LeJohn]

Tire hairs serve the purpose of testing the quality of tire rubber by pulling on them. If the hairs can be stretched and are difficult to break, it indicates good surface rubber quality. Conversely, if they break easily, it suggests poor rubber quality or that the product is expired. The tire mold is processed with many small holes to release gases generated during tire formation. After the tire is formed and cooled in the mold, some rubber material remains in the mold's vent holes. When the tire is removed from the mold, the rubber material in the vent holes forms tire hairs attached to the tire surface. Tires, generally made of wear-resistant rubber materials, come in two types: solid tires and pneumatic tires. Pneumatic tires consist of an inner tube and an outer tire. Manufacturers typically set the service life of tires at 3 years.