[StephenDeli]

Depends on what you are using them for. For sanding putty I use anywhere from 400-800 grit. Sanding paint use anywhere from 1800-12000 grit. Sanding down mold lines and bodies use 800 for the mold lines and work your way up to 2000. Primer fills the sand marks. So if I were you get all of them becuase they are not that expensive.