The Z 04 - 15 Tension Spring has a 4mm rod, 15 mm cylinder and 10-200 mm stroke. Progression is 17% ...
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The Z 06 - 19 Tension Spring has steel zinc plated fittings and 19mm steel black spray coated cylind...
The Z 10 - 28 Tension Spring has 20% progression with steel zinc plated fittings and 10mm steel chro...
The Z 28 - 40 Tension Spring has 40% progression, steel zinc plated fittings and 28mm steel chromium...