Tweezerman Glass Nail File Tweezerman Glass Nail File Tweezy Nude Nail File shapes and files nails with a long-lasting finish. Made from durable, high-density nano glass, the file is safe to use with a side-to-side motion and helps smooth the keratin layers together to keep nails strong and healthy. Packaged in a protective case, the file is perfect to keep with you on-the-go.