Silk is a natural lustrous fiber that has a high tensile strength. The fiber is so lustrous that weavers at times exploit the play of light in their patterns. Silk makes wonderful oriental carpets or rugs. It is also used as pattern highlights in woolen carpets. These carpets are rich and expensive and are usually made on the cotton foundation but some may even have silk foundation. Silk carpets or rugs are highly preferred in soft, even and dry areas owing to the delicacy of the fiber. Also, silk carpets require a high maintenance as compared to that of wool carpets.