Sterling 6 mm cord has a very durable sheath and high MBS which makes it great for prusik cords, cordelettes, ice threads, lightweight low stretch fixing and hauling tag lines. Can also be used in nonlife safety applications such as dog leashes, towlines, or even as decorative trim and cover.. . General purpose utility cord. Very durable sheath and high MBS minimum break strength. Ideal for slings and prusiks. NOT for use in lead climbing or rappelling. Sold by the foot. Can also be used for towlines, dog leashes, and as decorative trim.