The NA-SAVG2 chromax.black is a set of three black NA-AVG2 anti-vibration gaskets for using compatible Noctua 140x25-mm fans on water-cooling radiators and other applications that benefit from a tighter seal. Thanks to the extra-soft yet tear-resistant silicone rubber, the NA-AVG2 not only contributes to the reduction of air leakage between the fan and radiator, but also dampens any vibrations. This makes them an ideal accessory for performance enthusiasts who want to squeeze out those extra few percent of cooling efficiency!