Our U.S. patented (with 8 different colors) dust covers (www.rj-enterprises.com) are specially designed to prevent dust and moisture from getting into Telephone, Data, Ethernet (Category 5/5e/6/6A) Jacks and Patch Panels. Top quality with 16 years proven record. They are reusable, easy to use, easy to remove, easy to install, 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.