Built - in tread wear indicators look like narrow strips of smooth rubber across the tread and become visible as the tire surface wears. (chevyexchange.com)
For indoor furniture like this that won't be exposed to a ton of surface wear or moisture, wax does the job. (blog.jennasuedesign.com)
Fading is present along the dashtop surfacing and the driver's seat shows surface wear and a split across the seat cushion as shown in detail in the gallery below. (bringatrailer.com)