... Spring 2.Material: 45#,60#,65#,C70DA,C82DA,70#,80#,72A,72B,82B. 3.Spring for mattres,shock absorbers 4.Best price ... 1. Product Name: 2.5mm Spring Of Grade 452. Material: Steel GradeGB ... -0.173. Production Standard: GB 3206-824. Main Markets: Argentina, South Korea, Israel, Malaysia, Pakistan, Thailand, Philippines, Sri Lanka, Iran, Syria, Brazil, ...