"Stop damage from by dirt and debris for open RJ45 ports and unused plugs. L-com's unique RJ45 covers protect your valuable ports and cables. Made from flexible PVC, these covers attach easily and stay in place with a snug friction fit. Jack covers feature a low profile knob making for easy removal when the port in needed again. Plug covers also protect the delicate locking tab on modular plugs. Packaged in bags on 100 pieces and shipped from a vast stock for large projects."