... mattres,shock absorbers 4.Best price 1. Product Name: 4mm Spring Of Grade 452. Material: Steel GradeGB StandardCarbon%Silicon ... Nickel%Cuprum%45#0.44-0.460.20-0.230.57-0.600.0090.0080.02-0.090.03-0.070.07-0.173. Production ... 72A,72B,82B.7. Wire Gauge:0.2mm,0.3mm,0.4mm,0.5mm,0.6mm,0.7mm,0.88mm,0.9mm,1mm,1.2mm,1.3mm, ... 1.4mm,1.5mm,1.6mm,1.7mm ...