Sterling 6mm Accessory Cord: Larger cords are best suited for prusik cords, cordelettes, ice threads, lightweight low-stretch fixing and hauling "tag" lines. Assorted colors, if you have a preference, please call for availability. (Sold by the foot.) Return Policy: Climbing equipment sales are final. In order to guarantee the life saving integrity of the climbing gear we sell -- we cannot accept returns on any life safety climbing or mountaineering equipment.