Be sure you follow the advice of reviewers who said, “Be Careful!” I did, and I’m glad. thought this file was going to be like the PedEgg, which is good, but this thing is next level! If I had used the same technique with this file as I have with other callus removers, my feet would’ve been hamburger. With that being said, I’m very pleased with the results, especially for the price. The Colossal Foot Rasp Foot File gets the job done quickly. My feet can get pretty rough, but even I wouldn’t recommend using it more than every 2-3 weeks. Oh, and please, DO NOT use this on any non-callused skin, and keep out of reach of children.