The NA-SAVG1 chromax.black is a set of three black NA-AVG1 anti-vibration gaskets for using compatible Noctua 120x25mm fans on water cooling radiators or other applications that benefit from a tighter seal with the fan. Made from extra soft yet highly tear-proof silicone rubber, the NA-AVG1 help to damp minute vibrations and to reduce air loss between the fan and the radiator. As such, they are an ideal accessory for performance enthusiasts who want to squeeze out those extra few percent of cooling efficiency.