terrible for buffing dip powder [SEP] my experience with these buffer files is only for using them with dip powder nails i always do my own and have been buying buffer blocks from the local beauty supply store for years for cents when i saw these i thought that it would be perfect for me i was wrong these blocks do absolutely nothing i tried to use them all there is very little grit on the blocks at all so it was a task trying to smooth the surface of my nail if you are needing them for something else they may work for you but i would not advice them if you are getting them to do your own nails