I did this recently before laying a plywood subfloor. Builders had left a handful of plastic shims similar to these around. When they ran out I just cut my own of varying heights off the end of a CLS stud with a chop saw. It wasn't any more arduous.
Thanks. Those are the plastic ones I’ve got - really handy. I’m also looking for longer ones = maybe as much as 1m20, to take out some of the bigger dips in one go.
I did this recently before laying a plywood subfloor. Builders had left a handful of plastic shims similar to these around. When they ran out I just cut my own of varying heights off the end of a CLS stud with a chop saw. It wasn't any more arduous.