cooler master excalibur 120mm pwm case fan - barometric ball bearing r4-exbb-20pk-r0
excalibur as the name suggests is inspired by the legendary sword of king arthur from the middle ages . the nine massive sword-shaped blades are designed to produce exceptionally high air pressure which fortify the cooling efficiency when used in dense water cooling radiators or performance heatsinks . this is the first fan from cooler master to adopt barometric ball bearing bbb technology .