... :bright 4 Application :SS wire of spring S.S. 305 Hydrogen Annealed Wire : 1 Grades:Comm diano materials ,201,202,301 ... :Bright , Acid white,ma. etc 5 Explanation: Using large-scale hydrogen retreat equipment, scientific process, lean for profit gas temperature control ... , we return the grain size of the hydrogen silk organization more even, the surface quality is more exquisite ...