-- U.S. Patented. Speedy Identify unused/ available port -- Dust cover for RJ-45 Jacks, Patch Panels, Data Centers, Home Networks, etc. -- Color Coding (8 different colors). Top quality with 16 years proven record. Protect against moisture & dust build up in unused ports. Prevents the erosion of ethernet contact points. --Perfect and Tight fit-stay put-without flaws. Solidly Built & Reusable. Softer elastic plastic for snug fit. User Friendly Handle for easy insertion/removal. -- Keep your expensive switches clean and organized. Space efficient. Will not interfere with adjacent ports. Designed for high density application. -- 100 pieces per bag. 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 (Category 5/5e/6) Jacks and Patch Panels. 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.