Most of the Persian silk carpets are made in the city of Qum. They are very carefully and finely knotted. Qum Silk carpets entire foundation are made of silk, both the warp and weft, or sometimes only the warp are silk. Qum are now among the most popular of all Persian carpet, despite their short history, because of the superior standard of craftsmanship and the rich variety of patterns. The cartoons on which the patterns are based were devised by artists. They adopted many of the beautiful designs and motifs from other carpet producing regions and interpreted them with enormous skill.