16 black anti-vibration pads for up to 2 compatible 20cm fans Compatible with many popular Noctua fans such as the NF-A20 PWM, NF-A20 FLX and NF-A20 5V PWM (see Noctua.at website for detailed compatibility info) Pads minimise the transmission of minute vibrations while maintaining full compatibility with standard fan screws and most other mounting systems Black colour for creating stunning all-black themed builds with Noctua's chromax line fans Trusted Noctua quality backed up by 6-year manufacturer's warranty