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Tenderloin-
Never realised they were a thing until my bathroom guy turned up with a bag, “what are all these different coloured things for?”
Used them myself for a stud wall section joining an older wall that wasn’t straight and getting the plasterboard to mate up level boxing in pipes, makes you wonder what old timers did before plastic, probably whittled them out of wood one at a time...
Mr_Smyth
A bag of glazing shims/packers and a Stanley knife.
Likely 1 and 2 mm ones meticulously cut in half so they sit along the bottom edge of the shelf to even out any bumps in wall and maybe sit too high but sag level when shelf is loaded