[This review was collected as part of a promotion.] I bought the 80 grit and the 120 grit just try them and I was impresses at the lasting life of these little workhorses. And, please let the word little keep you from trying them out. I used mind to remove the curb rash on my aluminum wheels and saved alot time. By hand is just not the to go. I went back to my local hardware store and bought a back set.