This is Overdose 4Edge 1.2-2055 Twin Spring 1.2 Diameter 5.5 Coils 20mm HSP 2 pcs Red. Instead of a round wire, the 4Edge uses a profiled wire, a first for drift applications, allowing for a wide range of spring rates even in short stroke ranges. The 4Edge series is broadly divided into two types. The first is a single type with a 25mm free length. It features the traditional OD semi-open end with a slight gap at both ends, providing easy handling characteristics for front use. The second is a twin type with a helper spring. The main spring has a 20mm free length, and the helper spring also uses a profiled wire. The lightweight spring seat also improves overall spring compliance, particularly for rear use, improving traction performance. Another unique feature is the OD logo, which appears only when the helper springs are tightly fitted.
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