The protective cover of the crystal connector of 500pcs RJ45 dust plug network cable is made of silicone, ensuring durability and long time use. It is designed to protect the RJ45 connectors, protecting them from dust, dirt and water. The covers are easy to install and remove, providing a secure hold for your network cables. With yellow, red and black color options, you can easily identify different cables. Compatible with network cables, this pack of 500 dust plugs is a must-have in any network setup.