PCShopTalk posted a review on the Noctua NF-S12B FLX 120mm Fans
A quote from the article:
>> Noctua NF-S12B FLX 120mm Fans Review
This fan does not have Standard blade tips, but Bevelled blade tips to make the fan much quieter, with better airflow to noise and pressure to noise ratios.
>> Noctua NF-S12B FLX 120mm Fans Review