The thermal pad is used to transfer heat from the chip (bridge, microcircuit, VRM) to the cooling system. Those. to reduce the temperature of the chip, crystal

Primary use:
filling the space between video chips, microcircuits, video card memory, north bridge, south bridge and cooling system (radiator)

The kit include 5 large sheet with size 4x4":

100*100*0.5 mm - 1 pcs
100*100*1.0 mm + 3M sticky layer - 1 pcs
100*100*1.5 mm + 3M sticky layer - 1 pcs
100*100*2.0 mm - 1 pcs
100*100*2.5 mm - 1 pcs

good thermal conductivity - honest 3.6W/mk
easy to choose thickness - 5 different types

what is the sticky layer for? glue the heatsink or copper plate onto the memory chip that hangs upside down. 3M is very sturdy. Can be used as a regular thermal pad. It's more like a bonus

Installation order:
..A.. Cut off the required amount of thermal interface, the size of a chip or larger
..B.. Remove the film from the flat surface of the thermal pad
..C.. Slightly bend the gasket, lay, starting from the edge, on the surface (to remove air at the junction of the thermal pad and the chip)
..D.. Press the thermal pad until a light chip print appears
..E.. Holding the gasket by the edge, remove the upper smooth protective film
..F.. Install the radiator
Note. When replacing the thermal spacer, the thickness of the new one should be 0.05-0.3 mm greater than the thickness of the deformed part of the old one

any question is welcome..