1. The wire body is fire-resistant: the wire can not burn with open flames, and it is safer to use. 2. The line body is cold-resistant: the product can be used normally in an environment of -40 degree. 3. The thread body is made of non-toxic silicone material, which is not harmful to the skin. 4. The thread body is made of silicone material, which is soft and elastic with a texture. 5. Aluminum alloy shell, high-end atmosphere, no deformation.