Material Zinc Plated Zinc Plated Zinc Plated Zinc Plated Stainless Steel. The18 extension spring sizes include:0.016"x0.16"x0.39",0.016"x0.16"x0.59",0.016"x0.16"x0.79",0.016"x0.18"x1.18",0.016"x0.18"x1.75",0.02"x0.17"x0.81",0.02"x0.22"x1",0.02"x0.22"x1.4",0.02"x0.25"x0.39",0.02"x0.25"x0.86",0.02"x0.25"x1.5",0.02"x0.25"x2.01",0.02"x0.25"x2.52",0.03"x0.31"x1.12",0.03"x0.31"x1.24",0.03"x0.31"x1.75",0.03"x0.33"x1.43",0.03"x0.33"x1.85".
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