Just used these on a mod for a young kid, they allowed for the use of almost any dart while still gripping the dart with enough crush for firing power.
They are great, for a 2s build. My go to flywheels
I am not sure if these made it any more "Accurate," but they fit good and are pretty cheap as well. I paired it up with a 42.5 mm. Clear Worker Cage and Meishel 2.0 cage and it is doing just fine for the moment!