Noctua NA-SAV2 chromax.blue, Silicone Anti-Vibration Fan Mount Set (Blue, 20-pack) Rubber mounts for convenient, quick and vibration-free installation of fans in standard PC case fan mounting holes Blue colour for creating stunning blue/black themed builds with Noctuas chromax or industrialPPC line fans Premium grade silicone-rubber, extra soft and highly tear-proof at the same time Compatible with most Noctua fans as well as third party fans with open flange frames and standard 4.3mm diameter mounting holes Set includes 20 mounts for up to 5 fans; Trusted Noctua quality backed up with 6-year manufacturers warranty