Glass nail files are super gentle on your nails unlike traditional emery board files. Glass nail files help prevent splitting, cracking and peeling as they glide across, instead of tearing your nail, leaving a super smooth edge. You can even file back and forth with these! Glass files are also very hygienic because they are non-porous, meaning no bacteria or debris can grow or get trapped on the file surface. The best part is they last a lot longer than emery boards too! Since we're all about portability here at NBM, we added a ball chain feature to the protective sleeve which makes it easy to hang off your Cuticle Buddy® or anything else you can think of. File length: 3.5 in/9 cm.