About this item Buy in Bulk : Each pack contains 10 black straight nail files Double Sided : With 100/180 Grit. Designed with a rounded top and double-sided functionality, they feature sandpaper on the surface and foam at the mid-level Reusable : These nail files can be used many times Product Usage Instructions: The 100 grit side is relatively coarse, while the 180 grit side is finer. For the difference in usage between these two sides, please refer to the third to fifth images on our detail page. The dimensions of a single piece are 179mm in length, 19mm in width, and 4mm in thickness › See more product details