This nail file shape is the first of it's kind for perfectly shaped nails on the go. So the nail file basically curves to the shape of the nail so you won't have to move the nail file so much which is so great. I have been using mine for 6 months now and the grit is still in tact and hasnt worn out yet which is amazing. it also has a rough and a rougher side and comes in a nice little storage container not to mention it is essence so it is very affordable