Kerman carpets (sometimes "Kirman") are one of the traditional classifications of Persian carpets. They are named after the city of Kerman, which is both a city and a province located in south central Iran, though as with other such designations the term describes a type which may have been manufactured somewhere else. Kerman has been a major center for the production of high quality carpets since at least the 15th century. In the 18th century, some authors considered the carpets from the province of Kerman, especially at Siftan, to be the finest Persian carpets, partly because of the high quality of the wool from the region known as Carmania wool. In the world of antique Persian rugs, Kerman carpets are celebrated as being among the best. Kerman rugs are prized by collectors for a myriad of reasons, which includes but it not limited to: a wide range of designs, a broad pallet, utilization of natural dyes and fibers, immense tensile strength and abrasion resistance, and expert color combinations. No two Kerman rugs are precisely alike, but these general characteristics typify this enduringly popular style.