RetroCross Frame Sliders for Kawasaki Ninja 400RetroCross Frame Sliders for Kawasaki Ninja 400 RectroCross frame sliders are a No Cut design featuring lightweight aluminum inner mounting hardware with beefy slider pucks made of tough engineering grade polymer for excellent protection from scrapes and other serious damages to the fairings and tank if you lay it down at speed on track thus improving the stock looks. Slider pucks are designed from the top fairing part as it can be mounted onto the