stainless loose tube that is welded by laser can provide for the optical fiber the mechanical protechtion and overheating protection.high tensile strength,long span,distortion-resistant design,good damp-resistant and anti-hydrogen loss design;fast identification design when the number of cores of optical fiber exceeds 12,the addition of high modulus kalver reduces exterior diameter of the cable and minimizes the additional load on the tower;there is no need for anti-unreeling device and provide the customized design for the clients.