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 .99 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 wouldn't advice them if you are getting them to do your own nails.