Overclockers Online posted a review on the Noctua NF-S12B FLX 120mm Fan

Noctua makes excellent products and the NF-S12B FLX is no different. It is certainly a unique fan in terms of aesthetics, design and engineering. This is especially evident in the attention to detail that Noctua has paid to the fan - for example, the beveled blade tips. Using the included noise-reduction adaptors, you can make the fan run almost silently without compromising performance too much - not that it is loud by any means even at the normal setting.

Noctua NF-S12B FLX 120mm Fan Review