Do pay attention to the grit of the files you purchase. A higher number means a less abrasive file. I usually use a 240 grit file. I recommend Tropical Shine files which can easily be purchased from your local beauty supply. They last a long time, are inexpensive and are just the best files I have used. The 4 way buffer comes in either block form (pictured) or long thin traditional nail file shape. There are 3 or 4 different grits on these files, the roughest starting at about 400-600 grit, and going down until the smoothest grit feels like smooth leather. Again I recommend Tropical Shine, it is the longest lasting and most economical. They can be a little hard to find as well, but are carried by Sally’s Beauty Supply and can be found in some drugstores now as well. Try both shapes and choose the one you like best, both have advantages but I think the block shape will last longer.