Protect your SFP/XFP/SFP+ modules from dust & contaminants, by covering up the duplex LC connector when it's not in use. This 10-pack of SFP dust covers provides an inexpensive way to protect your network switches & fiber optic equipment from dust & contaminants, by covering the exposed & unused LC fiber optic ports. Simply insert the dust covers into the LC port of any SFP/SFP+ transceiver in your network switches. made from a durable rubber, the dust covers block dirt & dust particles that could cause connection issues from getting inside your equipment.