Coolers all fall off. darn. Downgraded, I need to replace it with better thermal double-sided tape. First review: I use it to cool a NEMA 17 stepper motor on my 3D printer's extruder. Not sure what other reviewers got, in my package I found (in addition to heatsinks) 4 pre-cut gaskets of unknown origin. While not very sticky, they conduct heat quite well. I know this because the temperature measured at the engine is equal to the temperature at the radiator, which is exactly what you want. I'm sure the extra surface area will help lower the engine's operating temperature. Good product, great price.