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'mโฆ