Our U.S. patented with 8 different colors dust covers are specially designed to prevent dust and moisture from getting into Telephone, Data (Category 5/5e/6) Jacks and Patch Panels. Protect your expensive Switches. Top quality with 16 years proven record. They are reusable, easy to use, and require no tools. The material is a solid, soft feeling, and translucent plastic designed to provide a snug fit with high visibility. These are especially great during the installation process of telephone or data systems. Multiple colors are available for color coding.