https://www.i-diskhouse.shop/product/dual-ball-oil-bearing-40x40x10mm-40mm-4cm-dc-brushless-cooling-fan-dc-5v-12v-24v-for-3d-printer-pc/
Dual Ball Bearing DC Brushless Cooling Fan 40x40x10mm DC 5V/12V/24V for 3D Printer PC