Jonsbo FR-531 RGB 120MM Case Cooling Fan with Controller ( Pack of 3 , 1300 RMP ) FR 531 is Jonsbo’s 120mm premium LED fan, available in 4 colours, red, blue, green and white. It has a unique blade design that can effectively remove the residual heat generated by hardware. The FR 531 fan kit comes in a set of 3 FR 531 fans. These are front facing colour changing customisable LED fans. It has a front circular design. The kit includes a fan controller that fits the PCI bracket for convenience. FR fans have large rubber shock absorbent pads on each side to minimise noise and vibration. This makes them perfect for sound editing systems. FR fans uses EU export standard environmental protection material to avoid causing e-waste.. FR 531 fans have large rubber shock absorbent pads on each side to minimise noise and vibration. This makes them perfect for sound editing systems. Moreover the fans come with an inbuilt 3/4 pins along with an additional connector for PSU connectivity for flexibility in rig building. FR-531 uses EU export standard environmental protection material to avoid causing e-waste.