steel wire details. Dia:0.2mm~13mm Tensile Strength: different classes as you need Standard: GB4357-89, DIN17223 ,JISG3512 spring steel wire for mattressdia: 1.2mm-5mmtensile strength :1400N -2300N/mm2matertial 65Mn and 70# SAE1070 Spring Steel Wire For Mattress
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