When it comes to three-ring binders, it seems the only choices at the office supply store are those made from plastic. These binders (and their matching plastic folders) are made from either PVC or polypropylene, which are difficult to recycle. When shopping for binders, consider searching for an alternative: aluminum. These durable, all-metal binders not only look good, but they are often made from recycled metal and are 100 percent recyclable. If you ever need to recycle it, just toss it into the recycling bin.