Bidjar rugs are also known as the iron rugs of Persia. They are heavy, stiff, thick and extremely dense. In fact, the majority of antique rugs are Bidjar rugs due to their inherent durability by the extraordinary method of weaving unique to this weaving group. Once a upon a time Bidjar were woven on wool foundation like all other tribal rugs, but they are now woven on cotton warps and wefts, resulting an even stronger rug that holds its shape well. This unique Kurdish weaving method demands each knot to be fully stacked, which means the warps are set at two levels, one on top of another. When a row is completed, a metal rod or heavy metal comb is inserted and hammered with force to pack down the triple wefts. As a result, Bidjar rugs are extremely durable, medium-pile rugs.
They are often weaved in rich dark colours with the classic Persian reds and blues. Herati design with French style roses in the border and corners are the most popular design for Bidjar rugs. They are sometimes woven in the Minahani pattern, as well as a design that features a large medallion anchored with palmettes, placed on either an open or a well-covered field. Bidjar rugs are available in a full range of sizes, from mats to 12 by 9 foot carpets. They are very expensive, but well worth the cost due to durability and high chance of surviving to antique status (minimum 100 years).