Topped off with Noctua’s trusted premium-grade SSO2 bearing; more than 150;000 hours MTTF and a 6-year manufacturer’s warranty; the NF-A14x25 G2 PWM Sx2-PP chromax.black is the perfect choice for users who are looking for a dual 140mm fan set that combines cutting-edge quality; quietness and performance in an all-black style.