Bidjar (also "Bijar") is the name of a small Kurdish town in western Iran. Kurdish carpets are often very strong and compact, which makes them extremely durable, and are known as ???the iron rugs of Persia". The weavers use their heavy comb, made of metal and wood, to beat the weft and the knots so that the wool pile almost stands up. The surface of the pile, therefore, becomes very compact, which prevents gravel and other small particles to be pressed into the carpet. The most common pattern is the Herati (also called fish pattern), but also medallions and floral motifs occur.