The company I work uses the Smead Green file backs with two fastners I have been using these for 3 years now. We have a filing closet wit hseveral filing cabinets where I am in charge of filing and keeping organized.. I have over 6000 files to organize and keep tidy. I love the Green File Folder fastners because they are strong and light and fit right in side by side. Some of these files date back to 2005 and the file folders are still strong and lasting after nearly 8 years!! Great Product! Lasting and Lasting. you can always recycle them too.