4Pcs/lot 4010 40*40*10mm Oil Bearing Turbo Cooling Fan 5V 12V 24V with 2 Pin Terminal Suitable For 3D Printer
https://www.vogueparade.com/shopping/EN/200366148/1/1005003495791277/4pcslot-4010-404010mm-oil-bearing-turbo-cooling-fan-5v-12v-24v-with-2-pin-terminal-suitable-for-3d-printer//