Description Overview This genuine AL‑KO Parabolic Slipper Spring (P/N 584525D) is a single-leaf tapered spring engineered for smoother trailer suspension performance. Its Dacromet zinc-alloy coating ensures excellent marine-grade corrosion resistance while providing a total 1,000 kg load capacity per pair (around 500 kg per spring). Supplied with a ½″ nylon bush, this spring is ideal for boat trailers and coastal-use trailers. Built for longevity and comfort, the parabolic design offers reduced weight and improved fatigue life compared to traditional multi-leaf setups. ✅ Key Features Parabolic single-leaf design reduces weight while maintaining strength Rated at 1,000 kg per pair for reliable trailer suspension Dacromet coating for best-in-class corrosion protection in saltwater environments Pre-fitted ½″ nylon bush for precise hanger alignment and smoother movement Compatible with AL‑KO eye-to-tail hanger systems